vdev.c revision 219089
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 */ 25 26#include <sys/zfs_context.h> 27#include <sys/fm/fs/zfs.h> 28#include <sys/spa.h> 29#include <sys/spa_impl.h> 30#include <sys/dmu.h> 31#include <sys/dmu_tx.h> 32#include <sys/vdev_impl.h> 33#include <sys/uberblock_impl.h> 34#include <sys/metaslab.h> 35#include <sys/metaslab_impl.h> 36#include <sys/space_map.h> 37#include <sys/zio.h> 38#include <sys/zap.h> 39#include <sys/fs/zfs.h> 40#include <sys/arc.h> 41#include <sys/zil.h> 42#include <sys/dsl_scan.h> 43 44SYSCTL_DECL(_vfs_zfs); 45SYSCTL_NODE(_vfs_zfs, OID_AUTO, vdev, CTLFLAG_RW, 0, "ZFS VDEV"); 46 47/* 48 * Virtual device management. 49 */ 50 51static vdev_ops_t *vdev_ops_table[] = { 52 &vdev_root_ops, 53 &vdev_raidz_ops, 54 &vdev_mirror_ops, 55 &vdev_replacing_ops, 56 &vdev_spare_ops, 57#ifdef _KERNEL 58 &vdev_geom_ops, 59#else 60 &vdev_disk_ops, 61#endif 62 &vdev_file_ops, 63 &vdev_missing_ops, 64 &vdev_hole_ops, 65 NULL 66}; 67 68/* maximum scrub/resilver I/O queue per leaf vdev */ 69int zfs_scrub_limit = 10; 70 71TUNABLE_INT("vfs.zfs.scrub_limit", &zfs_scrub_limit); 72SYSCTL_INT(_vfs_zfs, OID_AUTO, scrub_limit, CTLFLAG_RDTUN, &zfs_scrub_limit, 0, 73 "Maximum scrub/resilver I/O queue"); 74 75/* 76 * Given a vdev type, return the appropriate ops vector. 77 */ 78static vdev_ops_t * 79vdev_getops(const char *type) 80{ 81 vdev_ops_t *ops, **opspp; 82 83 for (opspp = vdev_ops_table; (ops = *opspp) != NULL; opspp++) 84 if (strcmp(ops->vdev_op_type, type) == 0) 85 break; 86 87 return (ops); 88} 89 90/* 91 * Default asize function: return the MAX of psize with the asize of 92 * all children. This is what's used by anything other than RAID-Z. 93 */ 94uint64_t 95vdev_default_asize(vdev_t *vd, uint64_t psize) 96{ 97 uint64_t asize = P2ROUNDUP(psize, 1ULL << vd->vdev_top->vdev_ashift); 98 uint64_t csize; 99 100 for (int c = 0; c < vd->vdev_children; c++) { 101 csize = vdev_psize_to_asize(vd->vdev_child[c], psize); 102 asize = MAX(asize, csize); 103 } 104 105 return (asize); 106} 107 108/* 109 * Get the minimum allocatable size. We define the allocatable size as 110 * the vdev's asize rounded to the nearest metaslab. This allows us to 111 * replace or attach devices which don't have the same physical size but 112 * can still satisfy the same number of allocations. 113 */ 114uint64_t 115vdev_get_min_asize(vdev_t *vd) 116{ 117 vdev_t *pvd = vd->vdev_parent; 118 119 /* 120 * The our parent is NULL (inactive spare or cache) or is the root, 121 * just return our own asize. 122 */ 123 if (pvd == NULL) 124 return (vd->vdev_asize); 125 126 /* 127 * The top-level vdev just returns the allocatable size rounded 128 * to the nearest metaslab. 129 */ 130 if (vd == vd->vdev_top) 131 return (P2ALIGN(vd->vdev_asize, 1ULL << vd->vdev_ms_shift)); 132 133 /* 134 * The allocatable space for a raidz vdev is N * sizeof(smallest child), 135 * so each child must provide at least 1/Nth of its asize. 136 */ 137 if (pvd->vdev_ops == &vdev_raidz_ops) 138 return (pvd->vdev_min_asize / pvd->vdev_children); 139 140 return (pvd->vdev_min_asize); 141} 142 143void 144vdev_set_min_asize(vdev_t *vd) 145{ 146 vd->vdev_min_asize = vdev_get_min_asize(vd); 147 148 for (int c = 0; c < vd->vdev_children; c++) 149 vdev_set_min_asize(vd->vdev_child[c]); 150} 151 152vdev_t * 153vdev_lookup_top(spa_t *spa, uint64_t vdev) 154{ 155 vdev_t *rvd = spa->spa_root_vdev; 156 157 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 158 159 if (vdev < rvd->vdev_children) { 160 ASSERT(rvd->vdev_child[vdev] != NULL); 161 return (rvd->vdev_child[vdev]); 162 } 163 164 return (NULL); 165} 166 167vdev_t * 168vdev_lookup_by_guid(vdev_t *vd, uint64_t guid) 169{ 170 vdev_t *mvd; 171 172 if (vd->vdev_guid == guid) 173 return (vd); 174 175 for (int c = 0; c < vd->vdev_children; c++) 176 if ((mvd = vdev_lookup_by_guid(vd->vdev_child[c], guid)) != 177 NULL) 178 return (mvd); 179 180 return (NULL); 181} 182 183void 184vdev_add_child(vdev_t *pvd, vdev_t *cvd) 185{ 186 size_t oldsize, newsize; 187 uint64_t id = cvd->vdev_id; 188 vdev_t **newchild; 189 190 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 191 ASSERT(cvd->vdev_parent == NULL); 192 193 cvd->vdev_parent = pvd; 194 195 if (pvd == NULL) 196 return; 197 198 ASSERT(id >= pvd->vdev_children || pvd->vdev_child[id] == NULL); 199 200 oldsize = pvd->vdev_children * sizeof (vdev_t *); 201 pvd->vdev_children = MAX(pvd->vdev_children, id + 1); 202 newsize = pvd->vdev_children * sizeof (vdev_t *); 203 204 newchild = kmem_zalloc(newsize, KM_SLEEP); 205 if (pvd->vdev_child != NULL) { 206 bcopy(pvd->vdev_child, newchild, oldsize); 207 kmem_free(pvd->vdev_child, oldsize); 208 } 209 210 pvd->vdev_child = newchild; 211 pvd->vdev_child[id] = cvd; 212 213 cvd->vdev_top = (pvd->vdev_top ? pvd->vdev_top: cvd); 214 ASSERT(cvd->vdev_top->vdev_parent->vdev_parent == NULL); 215 216 /* 217 * Walk up all ancestors to update guid sum. 218 */ 219 for (; pvd != NULL; pvd = pvd->vdev_parent) 220 pvd->vdev_guid_sum += cvd->vdev_guid_sum; 221} 222 223void 224vdev_remove_child(vdev_t *pvd, vdev_t *cvd) 225{ 226 int c; 227 uint_t id = cvd->vdev_id; 228 229 ASSERT(cvd->vdev_parent == pvd); 230 231 if (pvd == NULL) 232 return; 233 234 ASSERT(id < pvd->vdev_children); 235 ASSERT(pvd->vdev_child[id] == cvd); 236 237 pvd->vdev_child[id] = NULL; 238 cvd->vdev_parent = NULL; 239 240 for (c = 0; c < pvd->vdev_children; c++) 241 if (pvd->vdev_child[c]) 242 break; 243 244 if (c == pvd->vdev_children) { 245 kmem_free(pvd->vdev_child, c * sizeof (vdev_t *)); 246 pvd->vdev_child = NULL; 247 pvd->vdev_children = 0; 248 } 249 250 /* 251 * Walk up all ancestors to update guid sum. 252 */ 253 for (; pvd != NULL; pvd = pvd->vdev_parent) 254 pvd->vdev_guid_sum -= cvd->vdev_guid_sum; 255} 256 257/* 258 * Remove any holes in the child array. 259 */ 260void 261vdev_compact_children(vdev_t *pvd) 262{ 263 vdev_t **newchild, *cvd; 264 int oldc = pvd->vdev_children; 265 int newc; 266 267 ASSERT(spa_config_held(pvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 268 269 for (int c = newc = 0; c < oldc; c++) 270 if (pvd->vdev_child[c]) 271 newc++; 272 273 newchild = kmem_alloc(newc * sizeof (vdev_t *), KM_SLEEP); 274 275 for (int c = newc = 0; c < oldc; c++) { 276 if ((cvd = pvd->vdev_child[c]) != NULL) { 277 newchild[newc] = cvd; 278 cvd->vdev_id = newc++; 279 } 280 } 281 282 kmem_free(pvd->vdev_child, oldc * sizeof (vdev_t *)); 283 pvd->vdev_child = newchild; 284 pvd->vdev_children = newc; 285} 286 287/* 288 * Allocate and minimally initialize a vdev_t. 289 */ 290vdev_t * 291vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid, vdev_ops_t *ops) 292{ 293 vdev_t *vd; 294 295 vd = kmem_zalloc(sizeof (vdev_t), KM_SLEEP); 296 297 if (spa->spa_root_vdev == NULL) { 298 ASSERT(ops == &vdev_root_ops); 299 spa->spa_root_vdev = vd; 300 } 301 302 if (guid == 0 && ops != &vdev_hole_ops) { 303 if (spa->spa_root_vdev == vd) { 304 /* 305 * The root vdev's guid will also be the pool guid, 306 * which must be unique among all pools. 307 */ 308 guid = spa_generate_guid(NULL); 309 } else { 310 /* 311 * Any other vdev's guid must be unique within the pool. 312 */ 313 guid = spa_generate_guid(spa); 314 } 315 ASSERT(!spa_guid_exists(spa_guid(spa), guid)); 316 } 317 318 vd->vdev_spa = spa; 319 vd->vdev_id = id; 320 vd->vdev_guid = guid; 321 vd->vdev_guid_sum = guid; 322 vd->vdev_ops = ops; 323 vd->vdev_state = VDEV_STATE_CLOSED; 324 vd->vdev_ishole = (ops == &vdev_hole_ops); 325 326 mutex_init(&vd->vdev_dtl_lock, NULL, MUTEX_DEFAULT, NULL); 327 mutex_init(&vd->vdev_stat_lock, NULL, MUTEX_DEFAULT, NULL); 328 mutex_init(&vd->vdev_probe_lock, NULL, MUTEX_DEFAULT, NULL); 329 for (int t = 0; t < DTL_TYPES; t++) { 330 space_map_create(&vd->vdev_dtl[t], 0, -1ULL, 0, 331 &vd->vdev_dtl_lock); 332 } 333 txg_list_create(&vd->vdev_ms_list, 334 offsetof(struct metaslab, ms_txg_node)); 335 txg_list_create(&vd->vdev_dtl_list, 336 offsetof(struct vdev, vdev_dtl_node)); 337 vd->vdev_stat.vs_timestamp = gethrtime(); 338 vdev_queue_init(vd); 339 vdev_cache_init(vd); 340 341 return (vd); 342} 343 344/* 345 * Allocate a new vdev. The 'alloctype' is used to control whether we are 346 * creating a new vdev or loading an existing one - the behavior is slightly 347 * different for each case. 348 */ 349int 350vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, uint_t id, 351 int alloctype) 352{ 353 vdev_ops_t *ops; 354 char *type; 355 uint64_t guid = 0, islog, nparity; 356 vdev_t *vd; 357 358 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 359 360 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_TYPE, &type) != 0) 361 return (EINVAL); 362 363 if ((ops = vdev_getops(type)) == NULL) 364 return (EINVAL); 365 366 /* 367 * If this is a load, get the vdev guid from the nvlist. 368 * Otherwise, vdev_alloc_common() will generate one for us. 369 */ 370 if (alloctype == VDEV_ALLOC_LOAD) { 371 uint64_t label_id; 372 373 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ID, &label_id) || 374 label_id != id) 375 return (EINVAL); 376 377 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 378 return (EINVAL); 379 } else if (alloctype == VDEV_ALLOC_SPARE) { 380 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 381 return (EINVAL); 382 } else if (alloctype == VDEV_ALLOC_L2CACHE) { 383 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 384 return (EINVAL); 385 } else if (alloctype == VDEV_ALLOC_ROOTPOOL) { 386 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_GUID, &guid) != 0) 387 return (EINVAL); 388 } 389 390 /* 391 * The first allocated vdev must be of type 'root'. 392 */ 393 if (ops != &vdev_root_ops && spa->spa_root_vdev == NULL) 394 return (EINVAL); 395 396 /* 397 * Determine whether we're a log vdev. 398 */ 399 islog = 0; 400 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_LOG, &islog); 401 if (islog && spa_version(spa) < SPA_VERSION_SLOGS) 402 return (ENOTSUP); 403 404 if (ops == &vdev_hole_ops && spa_version(spa) < SPA_VERSION_HOLES) 405 return (ENOTSUP); 406 407 /* 408 * Set the nparity property for RAID-Z vdevs. 409 */ 410 nparity = -1ULL; 411 if (ops == &vdev_raidz_ops) { 412 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NPARITY, 413 &nparity) == 0) { 414 if (nparity == 0 || nparity > VDEV_RAIDZ_MAXPARITY) 415 return (EINVAL); 416 /* 417 * Previous versions could only support 1 or 2 parity 418 * device. 419 */ 420 if (nparity > 1 && 421 spa_version(spa) < SPA_VERSION_RAIDZ2) 422 return (ENOTSUP); 423 if (nparity > 2 && 424 spa_version(spa) < SPA_VERSION_RAIDZ3) 425 return (ENOTSUP); 426 } else { 427 /* 428 * We require the parity to be specified for SPAs that 429 * support multiple parity levels. 430 */ 431 if (spa_version(spa) >= SPA_VERSION_RAIDZ2) 432 return (EINVAL); 433 /* 434 * Otherwise, we default to 1 parity device for RAID-Z. 435 */ 436 nparity = 1; 437 } 438 } else { 439 nparity = 0; 440 } 441 ASSERT(nparity != -1ULL); 442 443 vd = vdev_alloc_common(spa, id, guid, ops); 444 445 vd->vdev_islog = islog; 446 vd->vdev_nparity = nparity; 447 448 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &vd->vdev_path) == 0) 449 vd->vdev_path = spa_strdup(vd->vdev_path); 450 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_DEVID, &vd->vdev_devid) == 0) 451 vd->vdev_devid = spa_strdup(vd->vdev_devid); 452 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PHYS_PATH, 453 &vd->vdev_physpath) == 0) 454 vd->vdev_physpath = spa_strdup(vd->vdev_physpath); 455 if (nvlist_lookup_string(nv, ZPOOL_CONFIG_FRU, &vd->vdev_fru) == 0) 456 vd->vdev_fru = spa_strdup(vd->vdev_fru); 457 458 /* 459 * Set the whole_disk property. If it's not specified, leave the value 460 * as -1. 461 */ 462 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK, 463 &vd->vdev_wholedisk) != 0) 464 vd->vdev_wholedisk = -1ULL; 465 466 /* 467 * Look for the 'not present' flag. This will only be set if the device 468 * was not present at the time of import. 469 */ 470 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, 471 &vd->vdev_not_present); 472 473 /* 474 * Get the alignment requirement. 475 */ 476 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASHIFT, &vd->vdev_ashift); 477 478 /* 479 * Retrieve the vdev creation time. 480 */ 481 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_CREATE_TXG, 482 &vd->vdev_crtxg); 483 484 /* 485 * If we're a top-level vdev, try to load the allocation parameters. 486 */ 487 if (parent && !parent->vdev_parent && 488 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_SPLIT)) { 489 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY, 490 &vd->vdev_ms_array); 491 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT, 492 &vd->vdev_ms_shift); 493 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_ASIZE, 494 &vd->vdev_asize); 495 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVING, 496 &vd->vdev_removing); 497 } 498 499 if (parent && !parent->vdev_parent) { 500 ASSERT(alloctype == VDEV_ALLOC_LOAD || 501 alloctype == VDEV_ALLOC_ADD || 502 alloctype == VDEV_ALLOC_SPLIT || 503 alloctype == VDEV_ALLOC_ROOTPOOL); 504 vd->vdev_mg = metaslab_group_create(islog ? 505 spa_log_class(spa) : spa_normal_class(spa), vd); 506 } 507 508 /* 509 * If we're a leaf vdev, try to load the DTL object and other state. 510 */ 511 if (vd->vdev_ops->vdev_op_leaf && 512 (alloctype == VDEV_ALLOC_LOAD || alloctype == VDEV_ALLOC_L2CACHE || 513 alloctype == VDEV_ALLOC_ROOTPOOL)) { 514 if (alloctype == VDEV_ALLOC_LOAD) { 515 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DTL, 516 &vd->vdev_dtl_smo.smo_object); 517 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_UNSPARE, 518 &vd->vdev_unspare); 519 } 520 521 if (alloctype == VDEV_ALLOC_ROOTPOOL) { 522 uint64_t spare = 0; 523 524 if (nvlist_lookup_uint64(nv, ZPOOL_CONFIG_IS_SPARE, 525 &spare) == 0 && spare) 526 spa_spare_add(vd); 527 } 528 529 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_OFFLINE, 530 &vd->vdev_offline); 531 532 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_RESILVERING, 533 &vd->vdev_resilvering); 534 535 /* 536 * When importing a pool, we want to ignore the persistent fault 537 * state, as the diagnosis made on another system may not be 538 * valid in the current context. Local vdevs will 539 * remain in the faulted state. 540 */ 541 if (spa_load_state(spa) == SPA_LOAD_OPEN) { 542 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_FAULTED, 543 &vd->vdev_faulted); 544 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_DEGRADED, 545 &vd->vdev_degraded); 546 (void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_REMOVED, 547 &vd->vdev_removed); 548 549 if (vd->vdev_faulted || vd->vdev_degraded) { 550 char *aux; 551 552 vd->vdev_label_aux = 553 VDEV_AUX_ERR_EXCEEDED; 554 if (nvlist_lookup_string(nv, 555 ZPOOL_CONFIG_AUX_STATE, &aux) == 0 && 556 strcmp(aux, "external") == 0) 557 vd->vdev_label_aux = VDEV_AUX_EXTERNAL; 558 } 559 } 560 } 561 562 /* 563 * Add ourselves to the parent's list of children. 564 */ 565 vdev_add_child(parent, vd); 566 567 *vdp = vd; 568 569 return (0); 570} 571 572void 573vdev_free(vdev_t *vd) 574{ 575 spa_t *spa = vd->vdev_spa; 576 577 /* 578 * vdev_free() implies closing the vdev first. This is simpler than 579 * trying to ensure complicated semantics for all callers. 580 */ 581 vdev_close(vd); 582 583 ASSERT(!list_link_active(&vd->vdev_config_dirty_node)); 584 ASSERT(!list_link_active(&vd->vdev_state_dirty_node)); 585 586 /* 587 * Free all children. 588 */ 589 for (int c = 0; c < vd->vdev_children; c++) 590 vdev_free(vd->vdev_child[c]); 591 592 ASSERT(vd->vdev_child == NULL); 593 ASSERT(vd->vdev_guid_sum == vd->vdev_guid); 594 595 /* 596 * Discard allocation state. 597 */ 598 if (vd->vdev_mg != NULL) { 599 vdev_metaslab_fini(vd); 600 metaslab_group_destroy(vd->vdev_mg); 601 } 602 603 ASSERT3U(vd->vdev_stat.vs_space, ==, 0); 604 ASSERT3U(vd->vdev_stat.vs_dspace, ==, 0); 605 ASSERT3U(vd->vdev_stat.vs_alloc, ==, 0); 606 607 /* 608 * Remove this vdev from its parent's child list. 609 */ 610 vdev_remove_child(vd->vdev_parent, vd); 611 612 ASSERT(vd->vdev_parent == NULL); 613 614 /* 615 * Clean up vdev structure. 616 */ 617 vdev_queue_fini(vd); 618 vdev_cache_fini(vd); 619 620 if (vd->vdev_path) 621 spa_strfree(vd->vdev_path); 622 if (vd->vdev_devid) 623 spa_strfree(vd->vdev_devid); 624 if (vd->vdev_physpath) 625 spa_strfree(vd->vdev_physpath); 626 if (vd->vdev_fru) 627 spa_strfree(vd->vdev_fru); 628 629 if (vd->vdev_isspare) 630 spa_spare_remove(vd); 631 if (vd->vdev_isl2cache) 632 spa_l2cache_remove(vd); 633 634 txg_list_destroy(&vd->vdev_ms_list); 635 txg_list_destroy(&vd->vdev_dtl_list); 636 637 mutex_enter(&vd->vdev_dtl_lock); 638 for (int t = 0; t < DTL_TYPES; t++) { 639 space_map_unload(&vd->vdev_dtl[t]); 640 space_map_destroy(&vd->vdev_dtl[t]); 641 } 642 mutex_exit(&vd->vdev_dtl_lock); 643 644 mutex_destroy(&vd->vdev_dtl_lock); 645 mutex_destroy(&vd->vdev_stat_lock); 646 mutex_destroy(&vd->vdev_probe_lock); 647 648 if (vd == spa->spa_root_vdev) 649 spa->spa_root_vdev = NULL; 650 651 kmem_free(vd, sizeof (vdev_t)); 652} 653 654/* 655 * Transfer top-level vdev state from svd to tvd. 656 */ 657static void 658vdev_top_transfer(vdev_t *svd, vdev_t *tvd) 659{ 660 spa_t *spa = svd->vdev_spa; 661 metaslab_t *msp; 662 vdev_t *vd; 663 int t; 664 665 ASSERT(tvd == tvd->vdev_top); 666 667 tvd->vdev_ms_array = svd->vdev_ms_array; 668 tvd->vdev_ms_shift = svd->vdev_ms_shift; 669 tvd->vdev_ms_count = svd->vdev_ms_count; 670 671 svd->vdev_ms_array = 0; 672 svd->vdev_ms_shift = 0; 673 svd->vdev_ms_count = 0; 674 675 tvd->vdev_mg = svd->vdev_mg; 676 tvd->vdev_ms = svd->vdev_ms; 677 678 svd->vdev_mg = NULL; 679 svd->vdev_ms = NULL; 680 681 if (tvd->vdev_mg != NULL) 682 tvd->vdev_mg->mg_vd = tvd; 683 684 tvd->vdev_stat.vs_alloc = svd->vdev_stat.vs_alloc; 685 tvd->vdev_stat.vs_space = svd->vdev_stat.vs_space; 686 tvd->vdev_stat.vs_dspace = svd->vdev_stat.vs_dspace; 687 688 svd->vdev_stat.vs_alloc = 0; 689 svd->vdev_stat.vs_space = 0; 690 svd->vdev_stat.vs_dspace = 0; 691 692 for (t = 0; t < TXG_SIZE; t++) { 693 while ((msp = txg_list_remove(&svd->vdev_ms_list, t)) != NULL) 694 (void) txg_list_add(&tvd->vdev_ms_list, msp, t); 695 while ((vd = txg_list_remove(&svd->vdev_dtl_list, t)) != NULL) 696 (void) txg_list_add(&tvd->vdev_dtl_list, vd, t); 697 if (txg_list_remove_this(&spa->spa_vdev_txg_list, svd, t)) 698 (void) txg_list_add(&spa->spa_vdev_txg_list, tvd, t); 699 } 700 701 if (list_link_active(&svd->vdev_config_dirty_node)) { 702 vdev_config_clean(svd); 703 vdev_config_dirty(tvd); 704 } 705 706 if (list_link_active(&svd->vdev_state_dirty_node)) { 707 vdev_state_clean(svd); 708 vdev_state_dirty(tvd); 709 } 710 711 tvd->vdev_deflate_ratio = svd->vdev_deflate_ratio; 712 svd->vdev_deflate_ratio = 0; 713 714 tvd->vdev_islog = svd->vdev_islog; 715 svd->vdev_islog = 0; 716} 717 718static void 719vdev_top_update(vdev_t *tvd, vdev_t *vd) 720{ 721 if (vd == NULL) 722 return; 723 724 vd->vdev_top = tvd; 725 726 for (int c = 0; c < vd->vdev_children; c++) 727 vdev_top_update(tvd, vd->vdev_child[c]); 728} 729 730/* 731 * Add a mirror/replacing vdev above an existing vdev. 732 */ 733vdev_t * 734vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops) 735{ 736 spa_t *spa = cvd->vdev_spa; 737 vdev_t *pvd = cvd->vdev_parent; 738 vdev_t *mvd; 739 740 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 741 742 mvd = vdev_alloc_common(spa, cvd->vdev_id, 0, ops); 743 744 mvd->vdev_asize = cvd->vdev_asize; 745 mvd->vdev_min_asize = cvd->vdev_min_asize; 746 mvd->vdev_ashift = cvd->vdev_ashift; 747 mvd->vdev_state = cvd->vdev_state; 748 mvd->vdev_crtxg = cvd->vdev_crtxg; 749 750 vdev_remove_child(pvd, cvd); 751 vdev_add_child(pvd, mvd); 752 cvd->vdev_id = mvd->vdev_children; 753 vdev_add_child(mvd, cvd); 754 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 755 756 if (mvd == mvd->vdev_top) 757 vdev_top_transfer(cvd, mvd); 758 759 return (mvd); 760} 761 762/* 763 * Remove a 1-way mirror/replacing vdev from the tree. 764 */ 765void 766vdev_remove_parent(vdev_t *cvd) 767{ 768 vdev_t *mvd = cvd->vdev_parent; 769 vdev_t *pvd = mvd->vdev_parent; 770 771 ASSERT(spa_config_held(cvd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 772 773 ASSERT(mvd->vdev_children == 1); 774 ASSERT(mvd->vdev_ops == &vdev_mirror_ops || 775 mvd->vdev_ops == &vdev_replacing_ops || 776 mvd->vdev_ops == &vdev_spare_ops); 777 cvd->vdev_ashift = mvd->vdev_ashift; 778 779 vdev_remove_child(mvd, cvd); 780 vdev_remove_child(pvd, mvd); 781 782 /* 783 * If cvd will replace mvd as a top-level vdev, preserve mvd's guid. 784 * Otherwise, we could have detached an offline device, and when we 785 * go to import the pool we'll think we have two top-level vdevs, 786 * instead of a different version of the same top-level vdev. 787 */ 788 if (mvd->vdev_top == mvd) { 789 uint64_t guid_delta = mvd->vdev_guid - cvd->vdev_guid; 790 cvd->vdev_orig_guid = cvd->vdev_guid; 791 cvd->vdev_guid += guid_delta; 792 cvd->vdev_guid_sum += guid_delta; 793 } 794 cvd->vdev_id = mvd->vdev_id; 795 vdev_add_child(pvd, cvd); 796 vdev_top_update(cvd->vdev_top, cvd->vdev_top); 797 798 if (cvd == cvd->vdev_top) 799 vdev_top_transfer(mvd, cvd); 800 801 ASSERT(mvd->vdev_children == 0); 802 vdev_free(mvd); 803} 804 805int 806vdev_metaslab_init(vdev_t *vd, uint64_t txg) 807{ 808 spa_t *spa = vd->vdev_spa; 809 objset_t *mos = spa->spa_meta_objset; 810 uint64_t m; 811 uint64_t oldc = vd->vdev_ms_count; 812 uint64_t newc = vd->vdev_asize >> vd->vdev_ms_shift; 813 metaslab_t **mspp; 814 int error; 815 816 ASSERT(txg == 0 || spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 817 818 /* 819 * This vdev is not being allocated from yet or is a hole. 820 */ 821 if (vd->vdev_ms_shift == 0) 822 return (0); 823 824 ASSERT(!vd->vdev_ishole); 825 826 /* 827 * Compute the raidz-deflation ratio. Note, we hard-code 828 * in 128k (1 << 17) because it is the current "typical" blocksize. 829 * Even if SPA_MAXBLOCKSIZE changes, this algorithm must never change, 830 * or we will inconsistently account for existing bp's. 831 */ 832 vd->vdev_deflate_ratio = (1 << 17) / 833 (vdev_psize_to_asize(vd, 1 << 17) >> SPA_MINBLOCKSHIFT); 834 835 ASSERT(oldc <= newc); 836 837 mspp = kmem_zalloc(newc * sizeof (*mspp), KM_SLEEP); 838 839 if (oldc != 0) { 840 bcopy(vd->vdev_ms, mspp, oldc * sizeof (*mspp)); 841 kmem_free(vd->vdev_ms, oldc * sizeof (*mspp)); 842 } 843 844 vd->vdev_ms = mspp; 845 vd->vdev_ms_count = newc; 846 847 for (m = oldc; m < newc; m++) { 848 space_map_obj_t smo = { 0, 0, 0 }; 849 if (txg == 0) { 850 uint64_t object = 0; 851 error = dmu_read(mos, vd->vdev_ms_array, 852 m * sizeof (uint64_t), sizeof (uint64_t), &object, 853 DMU_READ_PREFETCH); 854 if (error) 855 return (error); 856 if (object != 0) { 857 dmu_buf_t *db; 858 error = dmu_bonus_hold(mos, object, FTAG, &db); 859 if (error) 860 return (error); 861 ASSERT3U(db->db_size, >=, sizeof (smo)); 862 bcopy(db->db_data, &smo, sizeof (smo)); 863 ASSERT3U(smo.smo_object, ==, object); 864 dmu_buf_rele(db, FTAG); 865 } 866 } 867 vd->vdev_ms[m] = metaslab_init(vd->vdev_mg, &smo, 868 m << vd->vdev_ms_shift, 1ULL << vd->vdev_ms_shift, txg); 869 } 870 871 if (txg == 0) 872 spa_config_enter(spa, SCL_ALLOC, FTAG, RW_WRITER); 873 874 /* 875 * If the vdev is being removed we don't activate 876 * the metaslabs since we want to ensure that no new 877 * allocations are performed on this device. 878 */ 879 if (oldc == 0 && !vd->vdev_removing) 880 metaslab_group_activate(vd->vdev_mg); 881 882 if (txg == 0) 883 spa_config_exit(spa, SCL_ALLOC, FTAG); 884 885 return (0); 886} 887 888void 889vdev_metaslab_fini(vdev_t *vd) 890{ 891 uint64_t m; 892 uint64_t count = vd->vdev_ms_count; 893 894 if (vd->vdev_ms != NULL) { 895 metaslab_group_passivate(vd->vdev_mg); 896 for (m = 0; m < count; m++) 897 if (vd->vdev_ms[m] != NULL) 898 metaslab_fini(vd->vdev_ms[m]); 899 kmem_free(vd->vdev_ms, count * sizeof (metaslab_t *)); 900 vd->vdev_ms = NULL; 901 } 902} 903 904typedef struct vdev_probe_stats { 905 boolean_t vps_readable; 906 boolean_t vps_writeable; 907 int vps_flags; 908} vdev_probe_stats_t; 909 910static void 911vdev_probe_done(zio_t *zio) 912{ 913 spa_t *spa = zio->io_spa; 914 vdev_t *vd = zio->io_vd; 915 vdev_probe_stats_t *vps = zio->io_private; 916 917 ASSERT(vd->vdev_probe_zio != NULL); 918 919 if (zio->io_type == ZIO_TYPE_READ) { 920 if (zio->io_error == 0) 921 vps->vps_readable = 1; 922 if (zio->io_error == 0 && spa_writeable(spa)) { 923 zio_nowait(zio_write_phys(vd->vdev_probe_zio, vd, 924 zio->io_offset, zio->io_size, zio->io_data, 925 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 926 ZIO_PRIORITY_SYNC_WRITE, vps->vps_flags, B_TRUE)); 927 } else { 928 zio_buf_free(zio->io_data, zio->io_size); 929 } 930 } else if (zio->io_type == ZIO_TYPE_WRITE) { 931 if (zio->io_error == 0) 932 vps->vps_writeable = 1; 933 zio_buf_free(zio->io_data, zio->io_size); 934 } else if (zio->io_type == ZIO_TYPE_NULL) { 935 zio_t *pio; 936 937 vd->vdev_cant_read |= !vps->vps_readable; 938 vd->vdev_cant_write |= !vps->vps_writeable; 939 940 if (vdev_readable(vd) && 941 (vdev_writeable(vd) || !spa_writeable(spa))) { 942 zio->io_error = 0; 943 } else { 944 ASSERT(zio->io_error != 0); 945 zfs_ereport_post(FM_EREPORT_ZFS_PROBE_FAILURE, 946 spa, vd, NULL, 0, 0); 947 zio->io_error = ENXIO; 948 } 949 950 mutex_enter(&vd->vdev_probe_lock); 951 ASSERT(vd->vdev_probe_zio == zio); 952 vd->vdev_probe_zio = NULL; 953 mutex_exit(&vd->vdev_probe_lock); 954 955 while ((pio = zio_walk_parents(zio)) != NULL) 956 if (!vdev_accessible(vd, pio)) 957 pio->io_error = ENXIO; 958 959 kmem_free(vps, sizeof (*vps)); 960 } 961} 962 963/* 964 * Determine whether this device is accessible by reading and writing 965 * to several known locations: the pad regions of each vdev label 966 * but the first (which we leave alone in case it contains a VTOC). 967 */ 968zio_t * 969vdev_probe(vdev_t *vd, zio_t *zio) 970{ 971 spa_t *spa = vd->vdev_spa; 972 vdev_probe_stats_t *vps = NULL; 973 zio_t *pio; 974 975 ASSERT(vd->vdev_ops->vdev_op_leaf); 976 977 /* 978 * Don't probe the probe. 979 */ 980 if (zio && (zio->io_flags & ZIO_FLAG_PROBE)) 981 return (NULL); 982 983 /* 984 * To prevent 'probe storms' when a device fails, we create 985 * just one probe i/o at a time. All zios that want to probe 986 * this vdev will become parents of the probe io. 987 */ 988 mutex_enter(&vd->vdev_probe_lock); 989 990 if ((pio = vd->vdev_probe_zio) == NULL) { 991 vps = kmem_zalloc(sizeof (*vps), KM_SLEEP); 992 993 vps->vps_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_PROBE | 994 ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_AGGREGATE | 995 ZIO_FLAG_TRYHARD; 996 997 if (spa_config_held(spa, SCL_ZIO, RW_WRITER)) { 998 /* 999 * vdev_cant_read and vdev_cant_write can only 1000 * transition from TRUE to FALSE when we have the 1001 * SCL_ZIO lock as writer; otherwise they can only 1002 * transition from FALSE to TRUE. This ensures that 1003 * any zio looking at these values can assume that 1004 * failures persist for the life of the I/O. That's 1005 * important because when a device has intermittent 1006 * connectivity problems, we want to ensure that 1007 * they're ascribed to the device (ENXIO) and not 1008 * the zio (EIO). 1009 * 1010 * Since we hold SCL_ZIO as writer here, clear both 1011 * values so the probe can reevaluate from first 1012 * principles. 1013 */ 1014 vps->vps_flags |= ZIO_FLAG_CONFIG_WRITER; 1015 vd->vdev_cant_read = B_FALSE; 1016 vd->vdev_cant_write = B_FALSE; 1017 } 1018 1019 vd->vdev_probe_zio = pio = zio_null(NULL, spa, vd, 1020 vdev_probe_done, vps, 1021 vps->vps_flags | ZIO_FLAG_DONT_PROPAGATE); 1022 1023 /* 1024 * We can't change the vdev state in this context, so we 1025 * kick off an async task to do it on our behalf. 1026 */ 1027 if (zio != NULL) { 1028 vd->vdev_probe_wanted = B_TRUE; 1029 spa_async_request(spa, SPA_ASYNC_PROBE); 1030 } 1031 } 1032 1033 if (zio != NULL) 1034 zio_add_child(zio, pio); 1035 1036 mutex_exit(&vd->vdev_probe_lock); 1037 1038 if (vps == NULL) { 1039 ASSERT(zio != NULL); 1040 return (NULL); 1041 } 1042 1043 for (int l = 1; l < VDEV_LABELS; l++) { 1044 zio_nowait(zio_read_phys(pio, vd, 1045 vdev_label_offset(vd->vdev_psize, l, 1046 offsetof(vdev_label_t, vl_pad2)), 1047 VDEV_PAD_SIZE, zio_buf_alloc(VDEV_PAD_SIZE), 1048 ZIO_CHECKSUM_OFF, vdev_probe_done, vps, 1049 ZIO_PRIORITY_SYNC_READ, vps->vps_flags, B_TRUE)); 1050 } 1051 1052 if (zio == NULL) 1053 return (pio); 1054 1055 zio_nowait(pio); 1056 return (NULL); 1057} 1058 1059static void 1060vdev_open_child(void *arg) 1061{ 1062 vdev_t *vd = arg; 1063 1064 vd->vdev_open_thread = curthread; 1065 vd->vdev_open_error = vdev_open(vd); 1066 vd->vdev_open_thread = NULL; 1067} 1068 1069boolean_t 1070vdev_uses_zvols(vdev_t *vd) 1071{ 1072 if (vd->vdev_path && strncmp(vd->vdev_path, ZVOL_DIR, 1073 strlen(ZVOL_DIR)) == 0) 1074 return (B_TRUE); 1075 for (int c = 0; c < vd->vdev_children; c++) 1076 if (vdev_uses_zvols(vd->vdev_child[c])) 1077 return (B_TRUE); 1078 return (B_FALSE); 1079} 1080 1081void 1082vdev_open_children(vdev_t *vd) 1083{ 1084 taskq_t *tq; 1085 int children = vd->vdev_children; 1086 1087 /* 1088 * in order to handle pools on top of zvols, do the opens 1089 * in a single thread so that the same thread holds the 1090 * spa_namespace_lock 1091 */ 1092 if (B_TRUE || vdev_uses_zvols(vd)) { 1093 for (int c = 0; c < children; c++) 1094 vd->vdev_child[c]->vdev_open_error = 1095 vdev_open(vd->vdev_child[c]); 1096 return; 1097 } 1098 tq = taskq_create("vdev_open", children, minclsyspri, 1099 children, children, TASKQ_PREPOPULATE); 1100 1101 for (int c = 0; c < children; c++) 1102 VERIFY(taskq_dispatch(tq, vdev_open_child, vd->vdev_child[c], 1103 TQ_SLEEP) != 0); 1104 1105 taskq_destroy(tq); 1106} 1107 1108/* 1109 * Prepare a virtual device for access. 1110 */ 1111int 1112vdev_open(vdev_t *vd) 1113{ 1114 spa_t *spa = vd->vdev_spa; 1115 int error; 1116 uint64_t osize = 0; 1117 uint64_t asize, psize; 1118 uint64_t ashift = 0; 1119 1120 ASSERT(vd->vdev_open_thread == curthread || 1121 spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1122 ASSERT(vd->vdev_state == VDEV_STATE_CLOSED || 1123 vd->vdev_state == VDEV_STATE_CANT_OPEN || 1124 vd->vdev_state == VDEV_STATE_OFFLINE); 1125 1126 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1127 vd->vdev_cant_read = B_FALSE; 1128 vd->vdev_cant_write = B_FALSE; 1129 vd->vdev_min_asize = vdev_get_min_asize(vd); 1130 1131 /* 1132 * If this vdev is not removed, check its fault status. If it's 1133 * faulted, bail out of the open. 1134 */ 1135 if (!vd->vdev_removed && vd->vdev_faulted) { 1136 ASSERT(vd->vdev_children == 0); 1137 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1138 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1139 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1140 vd->vdev_label_aux); 1141 return (ENXIO); 1142 } else if (vd->vdev_offline) { 1143 ASSERT(vd->vdev_children == 0); 1144 vdev_set_state(vd, B_TRUE, VDEV_STATE_OFFLINE, VDEV_AUX_NONE); 1145 return (ENXIO); 1146 } 1147 1148 error = vd->vdev_ops->vdev_op_open(vd, &osize, &ashift); 1149 1150 /* 1151 * Reset the vdev_reopening flag so that we actually close 1152 * the vdev on error. 1153 */ 1154 vd->vdev_reopening = B_FALSE; 1155 if (zio_injection_enabled && error == 0) 1156 error = zio_handle_device_injection(vd, NULL, ENXIO); 1157 1158 if (error) { 1159 if (vd->vdev_removed && 1160 vd->vdev_stat.vs_aux != VDEV_AUX_OPEN_FAILED) 1161 vd->vdev_removed = B_FALSE; 1162 1163 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1164 vd->vdev_stat.vs_aux); 1165 return (error); 1166 } 1167 1168 vd->vdev_removed = B_FALSE; 1169 1170 /* 1171 * Recheck the faulted flag now that we have confirmed that 1172 * the vdev is accessible. If we're faulted, bail. 1173 */ 1174 if (vd->vdev_faulted) { 1175 ASSERT(vd->vdev_children == 0); 1176 ASSERT(vd->vdev_label_aux == VDEV_AUX_ERR_EXCEEDED || 1177 vd->vdev_label_aux == VDEV_AUX_EXTERNAL); 1178 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1179 vd->vdev_label_aux); 1180 return (ENXIO); 1181 } 1182 1183 if (vd->vdev_degraded) { 1184 ASSERT(vd->vdev_children == 0); 1185 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1186 VDEV_AUX_ERR_EXCEEDED); 1187 } else { 1188 vdev_set_state(vd, B_TRUE, VDEV_STATE_HEALTHY, 0); 1189 } 1190 1191 /* 1192 * For hole or missing vdevs we just return success. 1193 */ 1194 if (vd->vdev_ishole || vd->vdev_ops == &vdev_missing_ops) 1195 return (0); 1196 1197 for (int c = 0; c < vd->vdev_children; c++) { 1198 if (vd->vdev_child[c]->vdev_state != VDEV_STATE_HEALTHY) { 1199 vdev_set_state(vd, B_TRUE, VDEV_STATE_DEGRADED, 1200 VDEV_AUX_NONE); 1201 break; 1202 } 1203 } 1204 1205 osize = P2ALIGN(osize, (uint64_t)sizeof (vdev_label_t)); 1206 1207 if (vd->vdev_children == 0) { 1208 if (osize < SPA_MINDEVSIZE) { 1209 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1210 VDEV_AUX_TOO_SMALL); 1211 return (EOVERFLOW); 1212 } 1213 psize = osize; 1214 asize = osize - (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE); 1215 } else { 1216 if (vd->vdev_parent != NULL && osize < SPA_MINDEVSIZE - 1217 (VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE)) { 1218 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1219 VDEV_AUX_TOO_SMALL); 1220 return (EOVERFLOW); 1221 } 1222 psize = 0; 1223 asize = osize; 1224 } 1225 1226 vd->vdev_psize = psize; 1227 1228 /* 1229 * Make sure the allocatable size hasn't shrunk. 1230 */ 1231 if (asize < vd->vdev_min_asize) { 1232 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1233 VDEV_AUX_BAD_LABEL); 1234 return (EINVAL); 1235 } 1236 1237 if (vd->vdev_asize == 0) { 1238 /* 1239 * This is the first-ever open, so use the computed values. 1240 * For testing purposes, a higher ashift can be requested. 1241 */ 1242 vd->vdev_asize = asize; 1243 vd->vdev_ashift = MAX(ashift, vd->vdev_ashift); 1244 } else { 1245 /* 1246 * Make sure the alignment requirement hasn't increased. 1247 */ 1248 if (ashift > vd->vdev_top->vdev_ashift) { 1249 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1250 VDEV_AUX_BAD_LABEL); 1251 return (EINVAL); 1252 } 1253 } 1254 1255 /* 1256 * If all children are healthy and the asize has increased, 1257 * then we've experienced dynamic LUN growth. If automatic 1258 * expansion is enabled then use the additional space. 1259 */ 1260 if (vd->vdev_state == VDEV_STATE_HEALTHY && asize > vd->vdev_asize && 1261 (vd->vdev_expanding || spa->spa_autoexpand)) 1262 vd->vdev_asize = asize; 1263 1264 vdev_set_min_asize(vd); 1265 1266 /* 1267 * Ensure we can issue some IO before declaring the 1268 * vdev open for business. 1269 */ 1270 if (vd->vdev_ops->vdev_op_leaf && 1271 (error = zio_wait(vdev_probe(vd, NULL))) != 0) { 1272 vdev_set_state(vd, B_TRUE, VDEV_STATE_FAULTED, 1273 VDEV_AUX_ERR_EXCEEDED); 1274 return (error); 1275 } 1276 1277 /* 1278 * If a leaf vdev has a DTL, and seems healthy, then kick off a 1279 * resilver. But don't do this if we are doing a reopen for a scrub, 1280 * since this would just restart the scrub we are already doing. 1281 */ 1282 if (vd->vdev_ops->vdev_op_leaf && !spa->spa_scrub_reopen && 1283 vdev_resilver_needed(vd, NULL, NULL)) 1284 spa_async_request(spa, SPA_ASYNC_RESILVER); 1285 1286 return (0); 1287} 1288 1289/* 1290 * Called once the vdevs are all opened, this routine validates the label 1291 * contents. This needs to be done before vdev_load() so that we don't 1292 * inadvertently do repair I/Os to the wrong device. 1293 * 1294 * This function will only return failure if one of the vdevs indicates that it 1295 * has since been destroyed or exported. This is only possible if 1296 * /etc/zfs/zpool.cache was readonly at the time. Otherwise, the vdev state 1297 * will be updated but the function will return 0. 1298 */ 1299int 1300vdev_validate(vdev_t *vd) 1301{ 1302 spa_t *spa = vd->vdev_spa; 1303 nvlist_t *label; 1304 uint64_t guid = 0, top_guid; 1305 uint64_t state; 1306 1307 for (int c = 0; c < vd->vdev_children; c++) 1308 if (vdev_validate(vd->vdev_child[c]) != 0) 1309 return (EBADF); 1310 1311 /* 1312 * If the device has already failed, or was marked offline, don't do 1313 * any further validation. Otherwise, label I/O will fail and we will 1314 * overwrite the previous state. 1315 */ 1316 if (vd->vdev_ops->vdev_op_leaf && vdev_readable(vd)) { 1317 uint64_t aux_guid = 0; 1318 nvlist_t *nvl; 1319 1320 if ((label = vdev_label_read_config(vd)) == NULL) { 1321 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1322 VDEV_AUX_BAD_LABEL); 1323 return (0); 1324 } 1325 1326 /* 1327 * Determine if this vdev has been split off into another 1328 * pool. If so, then refuse to open it. 1329 */ 1330 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_SPLIT_GUID, 1331 &aux_guid) == 0 && aux_guid == spa_guid(spa)) { 1332 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1333 VDEV_AUX_SPLIT_POOL); 1334 nvlist_free(label); 1335 return (0); 1336 } 1337 1338 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_GUID, 1339 &guid) != 0 || guid != spa_guid(spa)) { 1340 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1341 VDEV_AUX_CORRUPT_DATA); 1342 nvlist_free(label); 1343 return (0); 1344 } 1345 1346 if (nvlist_lookup_nvlist(label, ZPOOL_CONFIG_VDEV_TREE, &nvl) 1347 != 0 || nvlist_lookup_uint64(nvl, ZPOOL_CONFIG_ORIG_GUID, 1348 &aux_guid) != 0) 1349 aux_guid = 0; 1350 1351 /* 1352 * If this vdev just became a top-level vdev because its 1353 * sibling was detached, it will have adopted the parent's 1354 * vdev guid -- but the label may or may not be on disk yet. 1355 * Fortunately, either version of the label will have the 1356 * same top guid, so if we're a top-level vdev, we can 1357 * safely compare to that instead. 1358 * 1359 * If we split this vdev off instead, then we also check the 1360 * original pool's guid. We don't want to consider the vdev 1361 * corrupt if it is partway through a split operation. 1362 */ 1363 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, 1364 &guid) != 0 || 1365 nvlist_lookup_uint64(label, ZPOOL_CONFIG_TOP_GUID, 1366 &top_guid) != 0 || 1367 ((vd->vdev_guid != guid && vd->vdev_guid != aux_guid) && 1368 (vd->vdev_guid != top_guid || vd != vd->vdev_top))) { 1369 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1370 VDEV_AUX_CORRUPT_DATA); 1371 nvlist_free(label); 1372 return (0); 1373 } 1374 1375 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, 1376 &state) != 0) { 1377 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1378 VDEV_AUX_CORRUPT_DATA); 1379 nvlist_free(label); 1380 return (0); 1381 } 1382 1383 nvlist_free(label); 1384 1385 /* 1386 * If this is a verbatim import, no need to check the 1387 * state of the pool. 1388 */ 1389 if (!(spa->spa_import_flags & ZFS_IMPORT_VERBATIM) && 1390 spa_load_state(spa) == SPA_LOAD_OPEN && 1391 state != POOL_STATE_ACTIVE) 1392 return (EBADF); 1393 1394 /* 1395 * If we were able to open and validate a vdev that was 1396 * previously marked permanently unavailable, clear that state 1397 * now. 1398 */ 1399 if (vd->vdev_not_present) 1400 vd->vdev_not_present = 0; 1401 } 1402 1403 return (0); 1404} 1405 1406/* 1407 * Close a virtual device. 1408 */ 1409void 1410vdev_close(vdev_t *vd) 1411{ 1412 spa_t *spa = vd->vdev_spa; 1413 vdev_t *pvd = vd->vdev_parent; 1414 1415 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1416 1417 /* 1418 * If our parent is reopening, then we are as well, unless we are 1419 * going offline. 1420 */ 1421 if (pvd != NULL && pvd->vdev_reopening) 1422 vd->vdev_reopening = (pvd->vdev_reopening && !vd->vdev_offline); 1423 1424 vd->vdev_ops->vdev_op_close(vd); 1425 1426 vdev_cache_purge(vd); 1427 1428 /* 1429 * We record the previous state before we close it, so that if we are 1430 * doing a reopen(), we don't generate FMA ereports if we notice that 1431 * it's still faulted. 1432 */ 1433 vd->vdev_prevstate = vd->vdev_state; 1434 1435 if (vd->vdev_offline) 1436 vd->vdev_state = VDEV_STATE_OFFLINE; 1437 else 1438 vd->vdev_state = VDEV_STATE_CLOSED; 1439 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 1440} 1441 1442void 1443vdev_hold(vdev_t *vd) 1444{ 1445 spa_t *spa = vd->vdev_spa; 1446 1447 ASSERT(spa_is_root(spa)); 1448 if (spa->spa_state == POOL_STATE_UNINITIALIZED) 1449 return; 1450 1451 for (int c = 0; c < vd->vdev_children; c++) 1452 vdev_hold(vd->vdev_child[c]); 1453 1454 if (vd->vdev_ops->vdev_op_leaf) 1455 vd->vdev_ops->vdev_op_hold(vd); 1456} 1457 1458void 1459vdev_rele(vdev_t *vd) 1460{ 1461 spa_t *spa = vd->vdev_spa; 1462 1463 ASSERT(spa_is_root(spa)); 1464 for (int c = 0; c < vd->vdev_children; c++) 1465 vdev_rele(vd->vdev_child[c]); 1466 1467 if (vd->vdev_ops->vdev_op_leaf) 1468 vd->vdev_ops->vdev_op_rele(vd); 1469} 1470 1471/* 1472 * Reopen all interior vdevs and any unopened leaves. We don't actually 1473 * reopen leaf vdevs which had previously been opened as they might deadlock 1474 * on the spa_config_lock. Instead we only obtain the leaf's physical size. 1475 * If the leaf has never been opened then open it, as usual. 1476 */ 1477void 1478vdev_reopen(vdev_t *vd) 1479{ 1480 spa_t *spa = vd->vdev_spa; 1481 1482 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1483 1484 /* set the reopening flag unless we're taking the vdev offline */ 1485 vd->vdev_reopening = !vd->vdev_offline; 1486 vdev_close(vd); 1487 (void) vdev_open(vd); 1488 1489 /* 1490 * Call vdev_validate() here to make sure we have the same device. 1491 * Otherwise, a device with an invalid label could be successfully 1492 * opened in response to vdev_reopen(). 1493 */ 1494 if (vd->vdev_aux) { 1495 (void) vdev_validate_aux(vd); 1496 if (vdev_readable(vd) && vdev_writeable(vd) && 1497 vd->vdev_aux == &spa->spa_l2cache && 1498 !l2arc_vdev_present(vd)) 1499 l2arc_add_vdev(spa, vd); 1500 } else { 1501 (void) vdev_validate(vd); 1502 } 1503 1504 /* 1505 * Reassess parent vdev's health. 1506 */ 1507 vdev_propagate_state(vd); 1508} 1509 1510int 1511vdev_create(vdev_t *vd, uint64_t txg, boolean_t isreplacing) 1512{ 1513 int error; 1514 1515 /* 1516 * Normally, partial opens (e.g. of a mirror) are allowed. 1517 * For a create, however, we want to fail the request if 1518 * there are any components we can't open. 1519 */ 1520 error = vdev_open(vd); 1521 1522 if (error || vd->vdev_state != VDEV_STATE_HEALTHY) { 1523 vdev_close(vd); 1524 return (error ? error : ENXIO); 1525 } 1526 1527 /* 1528 * Recursively initialize all labels. 1529 */ 1530 if ((error = vdev_label_init(vd, txg, isreplacing ? 1531 VDEV_LABEL_REPLACE : VDEV_LABEL_CREATE)) != 0) { 1532 vdev_close(vd); 1533 return (error); 1534 } 1535 1536 return (0); 1537} 1538 1539void 1540vdev_metaslab_set_size(vdev_t *vd) 1541{ 1542 /* 1543 * Aim for roughly 200 metaslabs per vdev. 1544 */ 1545 vd->vdev_ms_shift = highbit(vd->vdev_asize / 200); 1546 vd->vdev_ms_shift = MAX(vd->vdev_ms_shift, SPA_MAXBLOCKSHIFT); 1547} 1548 1549void 1550vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg) 1551{ 1552 ASSERT(vd == vd->vdev_top); 1553 ASSERT(!vd->vdev_ishole); 1554 ASSERT(ISP2(flags)); 1555 ASSERT(spa_writeable(vd->vdev_spa)); 1556 1557 if (flags & VDD_METASLAB) 1558 (void) txg_list_add(&vd->vdev_ms_list, arg, txg); 1559 1560 if (flags & VDD_DTL) 1561 (void) txg_list_add(&vd->vdev_dtl_list, arg, txg); 1562 1563 (void) txg_list_add(&vd->vdev_spa->spa_vdev_txg_list, vd, txg); 1564} 1565 1566/* 1567 * DTLs. 1568 * 1569 * A vdev's DTL (dirty time log) is the set of transaction groups for which 1570 * the vdev has less than perfect replication. There are four kinds of DTL: 1571 * 1572 * DTL_MISSING: txgs for which the vdev has no valid copies of the data 1573 * 1574 * DTL_PARTIAL: txgs for which data is available, but not fully replicated 1575 * 1576 * DTL_SCRUB: the txgs that could not be repaired by the last scrub; upon 1577 * scrub completion, DTL_SCRUB replaces DTL_MISSING in the range of 1578 * txgs that was scrubbed. 1579 * 1580 * DTL_OUTAGE: txgs which cannot currently be read, whether due to 1581 * persistent errors or just some device being offline. 1582 * Unlike the other three, the DTL_OUTAGE map is not generally 1583 * maintained; it's only computed when needed, typically to 1584 * determine whether a device can be detached. 1585 * 1586 * For leaf vdevs, DTL_MISSING and DTL_PARTIAL are identical: the device 1587 * either has the data or it doesn't. 1588 * 1589 * For interior vdevs such as mirror and RAID-Z the picture is more complex. 1590 * A vdev's DTL_PARTIAL is the union of its children's DTL_PARTIALs, because 1591 * if any child is less than fully replicated, then so is its parent. 1592 * A vdev's DTL_MISSING is a modified union of its children's DTL_MISSINGs, 1593 * comprising only those txgs which appear in 'maxfaults' or more children; 1594 * those are the txgs we don't have enough replication to read. For example, 1595 * double-parity RAID-Z can tolerate up to two missing devices (maxfaults == 2); 1596 * thus, its DTL_MISSING consists of the set of txgs that appear in more than 1597 * two child DTL_MISSING maps. 1598 * 1599 * It should be clear from the above that to compute the DTLs and outage maps 1600 * for all vdevs, it suffices to know just the leaf vdevs' DTL_MISSING maps. 1601 * Therefore, that is all we keep on disk. When loading the pool, or after 1602 * a configuration change, we generate all other DTLs from first principles. 1603 */ 1604void 1605vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 1606{ 1607 space_map_t *sm = &vd->vdev_dtl[t]; 1608 1609 ASSERT(t < DTL_TYPES); 1610 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 1611 ASSERT(spa_writeable(vd->vdev_spa)); 1612 1613 mutex_enter(sm->sm_lock); 1614 if (!space_map_contains(sm, txg, size)) 1615 space_map_add(sm, txg, size); 1616 mutex_exit(sm->sm_lock); 1617} 1618 1619boolean_t 1620vdev_dtl_contains(vdev_t *vd, vdev_dtl_type_t t, uint64_t txg, uint64_t size) 1621{ 1622 space_map_t *sm = &vd->vdev_dtl[t]; 1623 boolean_t dirty = B_FALSE; 1624 1625 ASSERT(t < DTL_TYPES); 1626 ASSERT(vd != vd->vdev_spa->spa_root_vdev); 1627 1628 mutex_enter(sm->sm_lock); 1629 if (sm->sm_space != 0) 1630 dirty = space_map_contains(sm, txg, size); 1631 mutex_exit(sm->sm_lock); 1632 1633 return (dirty); 1634} 1635 1636boolean_t 1637vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t t) 1638{ 1639 space_map_t *sm = &vd->vdev_dtl[t]; 1640 boolean_t empty; 1641 1642 mutex_enter(sm->sm_lock); 1643 empty = (sm->sm_space == 0); 1644 mutex_exit(sm->sm_lock); 1645 1646 return (empty); 1647} 1648 1649/* 1650 * Reassess DTLs after a config change or scrub completion. 1651 */ 1652void 1653vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg, int scrub_done) 1654{ 1655 spa_t *spa = vd->vdev_spa; 1656 avl_tree_t reftree; 1657 int minref; 1658 1659 ASSERT(spa_config_held(spa, SCL_ALL, RW_READER) != 0); 1660 1661 for (int c = 0; c < vd->vdev_children; c++) 1662 vdev_dtl_reassess(vd->vdev_child[c], txg, 1663 scrub_txg, scrub_done); 1664 1665 if (vd == spa->spa_root_vdev || vd->vdev_ishole || vd->vdev_aux) 1666 return; 1667 1668 if (vd->vdev_ops->vdev_op_leaf) { 1669 dsl_scan_t *scn = spa->spa_dsl_pool->dp_scan; 1670 1671 mutex_enter(&vd->vdev_dtl_lock); 1672 if (scrub_txg != 0 && 1673 (spa->spa_scrub_started || 1674 (scn && scn->scn_phys.scn_errors == 0))) { 1675 /* 1676 * We completed a scrub up to scrub_txg. If we 1677 * did it without rebooting, then the scrub dtl 1678 * will be valid, so excise the old region and 1679 * fold in the scrub dtl. Otherwise, leave the 1680 * dtl as-is if there was an error. 1681 * 1682 * There's little trick here: to excise the beginning 1683 * of the DTL_MISSING map, we put it into a reference 1684 * tree and then add a segment with refcnt -1 that 1685 * covers the range [0, scrub_txg). This means 1686 * that each txg in that range has refcnt -1 or 0. 1687 * We then add DTL_SCRUB with a refcnt of 2, so that 1688 * entries in the range [0, scrub_txg) will have a 1689 * positive refcnt -- either 1 or 2. We then convert 1690 * the reference tree into the new DTL_MISSING map. 1691 */ 1692 space_map_ref_create(&reftree); 1693 space_map_ref_add_map(&reftree, 1694 &vd->vdev_dtl[DTL_MISSING], 1); 1695 space_map_ref_add_seg(&reftree, 0, scrub_txg, -1); 1696 space_map_ref_add_map(&reftree, 1697 &vd->vdev_dtl[DTL_SCRUB], 2); 1698 space_map_ref_generate_map(&reftree, 1699 &vd->vdev_dtl[DTL_MISSING], 1); 1700 space_map_ref_destroy(&reftree); 1701 } 1702 space_map_vacate(&vd->vdev_dtl[DTL_PARTIAL], NULL, NULL); 1703 space_map_walk(&vd->vdev_dtl[DTL_MISSING], 1704 space_map_add, &vd->vdev_dtl[DTL_PARTIAL]); 1705 if (scrub_done) 1706 space_map_vacate(&vd->vdev_dtl[DTL_SCRUB], NULL, NULL); 1707 space_map_vacate(&vd->vdev_dtl[DTL_OUTAGE], NULL, NULL); 1708 if (!vdev_readable(vd)) 1709 space_map_add(&vd->vdev_dtl[DTL_OUTAGE], 0, -1ULL); 1710 else 1711 space_map_walk(&vd->vdev_dtl[DTL_MISSING], 1712 space_map_add, &vd->vdev_dtl[DTL_OUTAGE]); 1713 mutex_exit(&vd->vdev_dtl_lock); 1714 1715 if (txg != 0) 1716 vdev_dirty(vd->vdev_top, VDD_DTL, vd, txg); 1717 return; 1718 } 1719 1720 mutex_enter(&vd->vdev_dtl_lock); 1721 for (int t = 0; t < DTL_TYPES; t++) { 1722 /* account for child's outage in parent's missing map */ 1723 int s = (t == DTL_MISSING) ? DTL_OUTAGE: t; 1724 if (t == DTL_SCRUB) 1725 continue; /* leaf vdevs only */ 1726 if (t == DTL_PARTIAL) 1727 minref = 1; /* i.e. non-zero */ 1728 else if (vd->vdev_nparity != 0) 1729 minref = vd->vdev_nparity + 1; /* RAID-Z */ 1730 else 1731 minref = vd->vdev_children; /* any kind of mirror */ 1732 space_map_ref_create(&reftree); 1733 for (int c = 0; c < vd->vdev_children; c++) { 1734 vdev_t *cvd = vd->vdev_child[c]; 1735 mutex_enter(&cvd->vdev_dtl_lock); 1736 space_map_ref_add_map(&reftree, &cvd->vdev_dtl[s], 1); 1737 mutex_exit(&cvd->vdev_dtl_lock); 1738 } 1739 space_map_ref_generate_map(&reftree, &vd->vdev_dtl[t], minref); 1740 space_map_ref_destroy(&reftree); 1741 } 1742 mutex_exit(&vd->vdev_dtl_lock); 1743} 1744 1745static int 1746vdev_dtl_load(vdev_t *vd) 1747{ 1748 spa_t *spa = vd->vdev_spa; 1749 space_map_obj_t *smo = &vd->vdev_dtl_smo; 1750 objset_t *mos = spa->spa_meta_objset; 1751 dmu_buf_t *db; 1752 int error; 1753 1754 ASSERT(vd->vdev_children == 0); 1755 1756 if (smo->smo_object == 0) 1757 return (0); 1758 1759 ASSERT(!vd->vdev_ishole); 1760 1761 if ((error = dmu_bonus_hold(mos, smo->smo_object, FTAG, &db)) != 0) 1762 return (error); 1763 1764 ASSERT3U(db->db_size, >=, sizeof (*smo)); 1765 bcopy(db->db_data, smo, sizeof (*smo)); 1766 dmu_buf_rele(db, FTAG); 1767 1768 mutex_enter(&vd->vdev_dtl_lock); 1769 error = space_map_load(&vd->vdev_dtl[DTL_MISSING], 1770 NULL, SM_ALLOC, smo, mos); 1771 mutex_exit(&vd->vdev_dtl_lock); 1772 1773 return (error); 1774} 1775 1776void 1777vdev_dtl_sync(vdev_t *vd, uint64_t txg) 1778{ 1779 spa_t *spa = vd->vdev_spa; 1780 space_map_obj_t *smo = &vd->vdev_dtl_smo; 1781 space_map_t *sm = &vd->vdev_dtl[DTL_MISSING]; 1782 objset_t *mos = spa->spa_meta_objset; 1783 space_map_t smsync; 1784 kmutex_t smlock; 1785 dmu_buf_t *db; 1786 dmu_tx_t *tx; 1787 1788 ASSERT(!vd->vdev_ishole); 1789 1790 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 1791 1792 if (vd->vdev_detached) { 1793 if (smo->smo_object != 0) { 1794 int err = dmu_object_free(mos, smo->smo_object, tx); 1795 ASSERT3U(err, ==, 0); 1796 smo->smo_object = 0; 1797 } 1798 dmu_tx_commit(tx); 1799 return; 1800 } 1801 1802 if (smo->smo_object == 0) { 1803 ASSERT(smo->smo_objsize == 0); 1804 ASSERT(smo->smo_alloc == 0); 1805 smo->smo_object = dmu_object_alloc(mos, 1806 DMU_OT_SPACE_MAP, 1 << SPACE_MAP_BLOCKSHIFT, 1807 DMU_OT_SPACE_MAP_HEADER, sizeof (*smo), tx); 1808 ASSERT(smo->smo_object != 0); 1809 vdev_config_dirty(vd->vdev_top); 1810 } 1811 1812 mutex_init(&smlock, NULL, MUTEX_DEFAULT, NULL); 1813 1814 space_map_create(&smsync, sm->sm_start, sm->sm_size, sm->sm_shift, 1815 &smlock); 1816 1817 mutex_enter(&smlock); 1818 1819 mutex_enter(&vd->vdev_dtl_lock); 1820 space_map_walk(sm, space_map_add, &smsync); 1821 mutex_exit(&vd->vdev_dtl_lock); 1822 1823 space_map_truncate(smo, mos, tx); 1824 space_map_sync(&smsync, SM_ALLOC, smo, mos, tx); 1825 1826 space_map_destroy(&smsync); 1827 1828 mutex_exit(&smlock); 1829 mutex_destroy(&smlock); 1830 1831 VERIFY(0 == dmu_bonus_hold(mos, smo->smo_object, FTAG, &db)); 1832 dmu_buf_will_dirty(db, tx); 1833 ASSERT3U(db->db_size, >=, sizeof (*smo)); 1834 bcopy(smo, db->db_data, sizeof (*smo)); 1835 dmu_buf_rele(db, FTAG); 1836 1837 dmu_tx_commit(tx); 1838} 1839 1840/* 1841 * Determine whether the specified vdev can be offlined/detached/removed 1842 * without losing data. 1843 */ 1844boolean_t 1845vdev_dtl_required(vdev_t *vd) 1846{ 1847 spa_t *spa = vd->vdev_spa; 1848 vdev_t *tvd = vd->vdev_top; 1849 uint8_t cant_read = vd->vdev_cant_read; 1850 boolean_t required; 1851 1852 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 1853 1854 if (vd == spa->spa_root_vdev || vd == tvd) 1855 return (B_TRUE); 1856 1857 /* 1858 * Temporarily mark the device as unreadable, and then determine 1859 * whether this results in any DTL outages in the top-level vdev. 1860 * If not, we can safely offline/detach/remove the device. 1861 */ 1862 vd->vdev_cant_read = B_TRUE; 1863 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 1864 required = !vdev_dtl_empty(tvd, DTL_OUTAGE); 1865 vd->vdev_cant_read = cant_read; 1866 vdev_dtl_reassess(tvd, 0, 0, B_FALSE); 1867 1868 if (!required && zio_injection_enabled) 1869 required = !!zio_handle_device_injection(vd, NULL, ECHILD); 1870 1871 return (required); 1872} 1873 1874/* 1875 * Determine if resilver is needed, and if so the txg range. 1876 */ 1877boolean_t 1878vdev_resilver_needed(vdev_t *vd, uint64_t *minp, uint64_t *maxp) 1879{ 1880 boolean_t needed = B_FALSE; 1881 uint64_t thismin = UINT64_MAX; 1882 uint64_t thismax = 0; 1883 1884 if (vd->vdev_children == 0) { 1885 mutex_enter(&vd->vdev_dtl_lock); 1886 if (vd->vdev_dtl[DTL_MISSING].sm_space != 0 && 1887 vdev_writeable(vd)) { 1888 space_seg_t *ss; 1889 1890 ss = avl_first(&vd->vdev_dtl[DTL_MISSING].sm_root); 1891 thismin = ss->ss_start - 1; 1892 ss = avl_last(&vd->vdev_dtl[DTL_MISSING].sm_root); 1893 thismax = ss->ss_end; 1894 needed = B_TRUE; 1895 } 1896 mutex_exit(&vd->vdev_dtl_lock); 1897 } else { 1898 for (int c = 0; c < vd->vdev_children; c++) { 1899 vdev_t *cvd = vd->vdev_child[c]; 1900 uint64_t cmin, cmax; 1901 1902 if (vdev_resilver_needed(cvd, &cmin, &cmax)) { 1903 thismin = MIN(thismin, cmin); 1904 thismax = MAX(thismax, cmax); 1905 needed = B_TRUE; 1906 } 1907 } 1908 } 1909 1910 if (needed && minp) { 1911 *minp = thismin; 1912 *maxp = thismax; 1913 } 1914 return (needed); 1915} 1916 1917void 1918vdev_load(vdev_t *vd) 1919{ 1920 /* 1921 * Recursively load all children. 1922 */ 1923 for (int c = 0; c < vd->vdev_children; c++) 1924 vdev_load(vd->vdev_child[c]); 1925 1926 /* 1927 * If this is a top-level vdev, initialize its metaslabs. 1928 */ 1929 if (vd == vd->vdev_top && !vd->vdev_ishole && 1930 (vd->vdev_ashift == 0 || vd->vdev_asize == 0 || 1931 vdev_metaslab_init(vd, 0) != 0)) 1932 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1933 VDEV_AUX_CORRUPT_DATA); 1934 1935 /* 1936 * If this is a leaf vdev, load its DTL. 1937 */ 1938 if (vd->vdev_ops->vdev_op_leaf && vdev_dtl_load(vd) != 0) 1939 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1940 VDEV_AUX_CORRUPT_DATA); 1941} 1942 1943/* 1944 * The special vdev case is used for hot spares and l2cache devices. Its 1945 * sole purpose it to set the vdev state for the associated vdev. To do this, 1946 * we make sure that we can open the underlying device, then try to read the 1947 * label, and make sure that the label is sane and that it hasn't been 1948 * repurposed to another pool. 1949 */ 1950int 1951vdev_validate_aux(vdev_t *vd) 1952{ 1953 nvlist_t *label; 1954 uint64_t guid, version; 1955 uint64_t state; 1956 1957 if (!vdev_readable(vd)) 1958 return (0); 1959 1960 if ((label = vdev_label_read_config(vd)) == NULL) { 1961 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1962 VDEV_AUX_CORRUPT_DATA); 1963 return (-1); 1964 } 1965 1966 if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_VERSION, &version) != 0 || 1967 version > SPA_VERSION || 1968 nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, &guid) != 0 || 1969 guid != vd->vdev_guid || 1970 nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, &state) != 0) { 1971 vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN, 1972 VDEV_AUX_CORRUPT_DATA); 1973 nvlist_free(label); 1974 return (-1); 1975 } 1976 1977 /* 1978 * We don't actually check the pool state here. If it's in fact in 1979 * use by another pool, we update this fact on the fly when requested. 1980 */ 1981 nvlist_free(label); 1982 return (0); 1983} 1984 1985void 1986vdev_remove(vdev_t *vd, uint64_t txg) 1987{ 1988 spa_t *spa = vd->vdev_spa; 1989 objset_t *mos = spa->spa_meta_objset; 1990 dmu_tx_t *tx; 1991 1992 tx = dmu_tx_create_assigned(spa_get_dsl(spa), txg); 1993 1994 if (vd->vdev_dtl_smo.smo_object) { 1995 ASSERT3U(vd->vdev_dtl_smo.smo_alloc, ==, 0); 1996 (void) dmu_object_free(mos, vd->vdev_dtl_smo.smo_object, tx); 1997 vd->vdev_dtl_smo.smo_object = 0; 1998 } 1999 2000 if (vd->vdev_ms != NULL) { 2001 for (int m = 0; m < vd->vdev_ms_count; m++) { 2002 metaslab_t *msp = vd->vdev_ms[m]; 2003 2004 if (msp == NULL || msp->ms_smo.smo_object == 0) 2005 continue; 2006 2007 ASSERT3U(msp->ms_smo.smo_alloc, ==, 0); 2008 (void) dmu_object_free(mos, msp->ms_smo.smo_object, tx); 2009 msp->ms_smo.smo_object = 0; 2010 } 2011 } 2012 2013 if (vd->vdev_ms_array) { 2014 (void) dmu_object_free(mos, vd->vdev_ms_array, tx); 2015 vd->vdev_ms_array = 0; 2016 vd->vdev_ms_shift = 0; 2017 } 2018 dmu_tx_commit(tx); 2019} 2020 2021void 2022vdev_sync_done(vdev_t *vd, uint64_t txg) 2023{ 2024 metaslab_t *msp; 2025 boolean_t reassess = !txg_list_empty(&vd->vdev_ms_list, TXG_CLEAN(txg)); 2026 2027 ASSERT(!vd->vdev_ishole); 2028 2029 while (msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg))) 2030 metaslab_sync_done(msp, txg); 2031 2032 if (reassess) 2033 metaslab_sync_reassess(vd->vdev_mg); 2034} 2035 2036void 2037vdev_sync(vdev_t *vd, uint64_t txg) 2038{ 2039 spa_t *spa = vd->vdev_spa; 2040 vdev_t *lvd; 2041 metaslab_t *msp; 2042 dmu_tx_t *tx; 2043 2044 ASSERT(!vd->vdev_ishole); 2045 2046 if (vd->vdev_ms_array == 0 && vd->vdev_ms_shift != 0) { 2047 ASSERT(vd == vd->vdev_top); 2048 tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); 2049 vd->vdev_ms_array = dmu_object_alloc(spa->spa_meta_objset, 2050 DMU_OT_OBJECT_ARRAY, 0, DMU_OT_NONE, 0, tx); 2051 ASSERT(vd->vdev_ms_array != 0); 2052 vdev_config_dirty(vd); 2053 dmu_tx_commit(tx); 2054 } 2055 2056 /* 2057 * Remove the metadata associated with this vdev once it's empty. 2058 */ 2059 if (vd->vdev_stat.vs_alloc == 0 && vd->vdev_removing) 2060 vdev_remove(vd, txg); 2061 2062 while ((msp = txg_list_remove(&vd->vdev_ms_list, txg)) != NULL) { 2063 metaslab_sync(msp, txg); 2064 (void) txg_list_add(&vd->vdev_ms_list, msp, TXG_CLEAN(txg)); 2065 } 2066 2067 while ((lvd = txg_list_remove(&vd->vdev_dtl_list, txg)) != NULL) 2068 vdev_dtl_sync(lvd, txg); 2069 2070 (void) txg_list_add(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg)); 2071} 2072 2073uint64_t 2074vdev_psize_to_asize(vdev_t *vd, uint64_t psize) 2075{ 2076 return (vd->vdev_ops->vdev_op_asize(vd, psize)); 2077} 2078 2079/* 2080 * Mark the given vdev faulted. A faulted vdev behaves as if the device could 2081 * not be opened, and no I/O is attempted. 2082 */ 2083int 2084vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux) 2085{ 2086 vdev_t *vd, *tvd; 2087 2088 spa_vdev_state_enter(spa, SCL_NONE); 2089 2090 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2091 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2092 2093 if (!vd->vdev_ops->vdev_op_leaf) 2094 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2095 2096 tvd = vd->vdev_top; 2097 2098 /* 2099 * We don't directly use the aux state here, but if we do a 2100 * vdev_reopen(), we need this value to be present to remember why we 2101 * were faulted. 2102 */ 2103 vd->vdev_label_aux = aux; 2104 2105 /* 2106 * Faulted state takes precedence over degraded. 2107 */ 2108 vd->vdev_delayed_close = B_FALSE; 2109 vd->vdev_faulted = 1ULL; 2110 vd->vdev_degraded = 0ULL; 2111 vdev_set_state(vd, B_FALSE, VDEV_STATE_FAULTED, aux); 2112 2113 /* 2114 * If this device has the only valid copy of the data, then 2115 * back off and simply mark the vdev as degraded instead. 2116 */ 2117 if (!tvd->vdev_islog && vd->vdev_aux == NULL && vdev_dtl_required(vd)) { 2118 vd->vdev_degraded = 1ULL; 2119 vd->vdev_faulted = 0ULL; 2120 2121 /* 2122 * If we reopen the device and it's not dead, only then do we 2123 * mark it degraded. 2124 */ 2125 vdev_reopen(tvd); 2126 2127 if (vdev_readable(vd)) 2128 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, aux); 2129 } 2130 2131 return (spa_vdev_state_exit(spa, vd, 0)); 2132} 2133 2134/* 2135 * Mark the given vdev degraded. A degraded vdev is purely an indication to the 2136 * user that something is wrong. The vdev continues to operate as normal as far 2137 * as I/O is concerned. 2138 */ 2139int 2140vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux) 2141{ 2142 vdev_t *vd; 2143 2144 spa_vdev_state_enter(spa, SCL_NONE); 2145 2146 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2147 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2148 2149 if (!vd->vdev_ops->vdev_op_leaf) 2150 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2151 2152 /* 2153 * If the vdev is already faulted, then don't do anything. 2154 */ 2155 if (vd->vdev_faulted || vd->vdev_degraded) 2156 return (spa_vdev_state_exit(spa, NULL, 0)); 2157 2158 vd->vdev_degraded = 1ULL; 2159 if (!vdev_is_dead(vd)) 2160 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, 2161 aux); 2162 2163 return (spa_vdev_state_exit(spa, vd, 0)); 2164} 2165 2166/* 2167 * Online the given vdev. If 'unspare' is set, it implies two things. First, 2168 * any attached spare device should be detached when the device finishes 2169 * resilvering. Second, the online should be treated like a 'test' online case, 2170 * so no FMA events are generated if the device fails to open. 2171 */ 2172int 2173vdev_online(spa_t *spa, uint64_t guid, uint64_t flags, vdev_state_t *newstate) 2174{ 2175 vdev_t *vd, *tvd, *pvd, *rvd = spa->spa_root_vdev; 2176 2177 spa_vdev_state_enter(spa, SCL_NONE); 2178 2179 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2180 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2181 2182 if (!vd->vdev_ops->vdev_op_leaf) 2183 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2184 2185 tvd = vd->vdev_top; 2186 vd->vdev_offline = B_FALSE; 2187 vd->vdev_tmpoffline = B_FALSE; 2188 vd->vdev_checkremove = !!(flags & ZFS_ONLINE_CHECKREMOVE); 2189 vd->vdev_forcefault = !!(flags & ZFS_ONLINE_FORCEFAULT); 2190 2191 /* XXX - L2ARC 1.0 does not support expansion */ 2192 if (!vd->vdev_aux) { 2193 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2194 pvd->vdev_expanding = !!(flags & ZFS_ONLINE_EXPAND); 2195 } 2196 2197 vdev_reopen(tvd); 2198 vd->vdev_checkremove = vd->vdev_forcefault = B_FALSE; 2199 2200 if (!vd->vdev_aux) { 2201 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2202 pvd->vdev_expanding = B_FALSE; 2203 } 2204 2205 if (newstate) 2206 *newstate = vd->vdev_state; 2207 if ((flags & ZFS_ONLINE_UNSPARE) && 2208 !vdev_is_dead(vd) && vd->vdev_parent && 2209 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 2210 vd->vdev_parent->vdev_child[0] == vd) 2211 vd->vdev_unspare = B_TRUE; 2212 2213 if ((flags & ZFS_ONLINE_EXPAND) || spa->spa_autoexpand) { 2214 2215 /* XXX - L2ARC 1.0 does not support expansion */ 2216 if (vd->vdev_aux) 2217 return (spa_vdev_state_exit(spa, vd, ENOTSUP)); 2218 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 2219 } 2220 return (spa_vdev_state_exit(spa, vd, 0)); 2221} 2222 2223static int 2224vdev_offline_locked(spa_t *spa, uint64_t guid, uint64_t flags) 2225{ 2226 vdev_t *vd, *tvd; 2227 int error = 0; 2228 uint64_t generation; 2229 metaslab_group_t *mg; 2230 2231top: 2232 spa_vdev_state_enter(spa, SCL_ALLOC); 2233 2234 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 2235 return (spa_vdev_state_exit(spa, NULL, ENODEV)); 2236 2237 if (!vd->vdev_ops->vdev_op_leaf) 2238 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 2239 2240 tvd = vd->vdev_top; 2241 mg = tvd->vdev_mg; 2242 generation = spa->spa_config_generation + 1; 2243 2244 /* 2245 * If the device isn't already offline, try to offline it. 2246 */ 2247 if (!vd->vdev_offline) { 2248 /* 2249 * If this device has the only valid copy of some data, 2250 * don't allow it to be offlined. Log devices are always 2251 * expendable. 2252 */ 2253 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 2254 vdev_dtl_required(vd)) 2255 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 2256 2257 /* 2258 * If the top-level is a slog and it has had allocations 2259 * then proceed. We check that the vdev's metaslab group 2260 * is not NULL since it's possible that we may have just 2261 * added this vdev but not yet initialized its metaslabs. 2262 */ 2263 if (tvd->vdev_islog && mg != NULL) { 2264 /* 2265 * Prevent any future allocations. 2266 */ 2267 metaslab_group_passivate(mg); 2268 (void) spa_vdev_state_exit(spa, vd, 0); 2269 2270 error = spa_offline_log(spa); 2271 2272 spa_vdev_state_enter(spa, SCL_ALLOC); 2273 2274 /* 2275 * Check to see if the config has changed. 2276 */ 2277 if (error || generation != spa->spa_config_generation) { 2278 metaslab_group_activate(mg); 2279 if (error) 2280 return (spa_vdev_state_exit(spa, 2281 vd, error)); 2282 (void) spa_vdev_state_exit(spa, vd, 0); 2283 goto top; 2284 } 2285 ASSERT3U(tvd->vdev_stat.vs_alloc, ==, 0); 2286 } 2287 2288 /* 2289 * Offline this device and reopen its top-level vdev. 2290 * If the top-level vdev is a log device then just offline 2291 * it. Otherwise, if this action results in the top-level 2292 * vdev becoming unusable, undo it and fail the request. 2293 */ 2294 vd->vdev_offline = B_TRUE; 2295 vdev_reopen(tvd); 2296 2297 if (!tvd->vdev_islog && vd->vdev_aux == NULL && 2298 vdev_is_dead(tvd)) { 2299 vd->vdev_offline = B_FALSE; 2300 vdev_reopen(tvd); 2301 return (spa_vdev_state_exit(spa, NULL, EBUSY)); 2302 } 2303 2304 /* 2305 * Add the device back into the metaslab rotor so that 2306 * once we online the device it's open for business. 2307 */ 2308 if (tvd->vdev_islog && mg != NULL) 2309 metaslab_group_activate(mg); 2310 } 2311 2312 vd->vdev_tmpoffline = !!(flags & ZFS_OFFLINE_TEMPORARY); 2313 2314 return (spa_vdev_state_exit(spa, vd, 0)); 2315} 2316 2317int 2318vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags) 2319{ 2320 int error; 2321 2322 mutex_enter(&spa->spa_vdev_top_lock); 2323 error = vdev_offline_locked(spa, guid, flags); 2324 mutex_exit(&spa->spa_vdev_top_lock); 2325 2326 return (error); 2327} 2328 2329/* 2330 * Clear the error counts associated with this vdev. Unlike vdev_online() and 2331 * vdev_offline(), we assume the spa config is locked. We also clear all 2332 * children. If 'vd' is NULL, then the user wants to clear all vdevs. 2333 */ 2334void 2335vdev_clear(spa_t *spa, vdev_t *vd) 2336{ 2337 vdev_t *rvd = spa->spa_root_vdev; 2338 2339 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 2340 2341 if (vd == NULL) 2342 vd = rvd; 2343 2344 vd->vdev_stat.vs_read_errors = 0; 2345 vd->vdev_stat.vs_write_errors = 0; 2346 vd->vdev_stat.vs_checksum_errors = 0; 2347 2348 for (int c = 0; c < vd->vdev_children; c++) 2349 vdev_clear(spa, vd->vdev_child[c]); 2350 2351 /* 2352 * If we're in the FAULTED state or have experienced failed I/O, then 2353 * clear the persistent state and attempt to reopen the device. We 2354 * also mark the vdev config dirty, so that the new faulted state is 2355 * written out to disk. 2356 */ 2357 if (vd->vdev_faulted || vd->vdev_degraded || 2358 !vdev_readable(vd) || !vdev_writeable(vd)) { 2359 2360 /* 2361 * When reopening in reponse to a clear event, it may be due to 2362 * a fmadm repair request. In this case, if the device is 2363 * still broken, we want to still post the ereport again. 2364 */ 2365 vd->vdev_forcefault = B_TRUE; 2366 2367 vd->vdev_faulted = vd->vdev_degraded = 0ULL; 2368 vd->vdev_cant_read = B_FALSE; 2369 vd->vdev_cant_write = B_FALSE; 2370 2371 vdev_reopen(vd == rvd ? rvd : vd->vdev_top); 2372 2373 vd->vdev_forcefault = B_FALSE; 2374 2375 if (vd != rvd && vdev_writeable(vd->vdev_top)) 2376 vdev_state_dirty(vd->vdev_top); 2377 2378 if (vd->vdev_aux == NULL && !vdev_is_dead(vd)) 2379 spa_async_request(spa, SPA_ASYNC_RESILVER); 2380 2381 spa_event_notify(spa, vd, ESC_ZFS_VDEV_CLEAR); 2382 } 2383 2384 /* 2385 * When clearing a FMA-diagnosed fault, we always want to 2386 * unspare the device, as we assume that the original spare was 2387 * done in response to the FMA fault. 2388 */ 2389 if (!vdev_is_dead(vd) && vd->vdev_parent != NULL && 2390 vd->vdev_parent->vdev_ops == &vdev_spare_ops && 2391 vd->vdev_parent->vdev_child[0] == vd) 2392 vd->vdev_unspare = B_TRUE; 2393} 2394 2395boolean_t 2396vdev_is_dead(vdev_t *vd) 2397{ 2398 /* 2399 * Holes and missing devices are always considered "dead". 2400 * This simplifies the code since we don't have to check for 2401 * these types of devices in the various code paths. 2402 * Instead we rely on the fact that we skip over dead devices 2403 * before issuing I/O to them. 2404 */ 2405 return (vd->vdev_state < VDEV_STATE_DEGRADED || vd->vdev_ishole || 2406 vd->vdev_ops == &vdev_missing_ops); 2407} 2408 2409boolean_t 2410vdev_readable(vdev_t *vd) 2411{ 2412 return (!vdev_is_dead(vd) && !vd->vdev_cant_read); 2413} 2414 2415boolean_t 2416vdev_writeable(vdev_t *vd) 2417{ 2418 return (!vdev_is_dead(vd) && !vd->vdev_cant_write); 2419} 2420 2421boolean_t 2422vdev_allocatable(vdev_t *vd) 2423{ 2424 uint64_t state = vd->vdev_state; 2425 2426 /* 2427 * We currently allow allocations from vdevs which may be in the 2428 * process of reopening (i.e. VDEV_STATE_CLOSED). If the device 2429 * fails to reopen then we'll catch it later when we're holding 2430 * the proper locks. Note that we have to get the vdev state 2431 * in a local variable because although it changes atomically, 2432 * we're asking two separate questions about it. 2433 */ 2434 return (!(state < VDEV_STATE_DEGRADED && state != VDEV_STATE_CLOSED) && 2435 !vd->vdev_cant_write && !vd->vdev_ishole); 2436} 2437 2438boolean_t 2439vdev_accessible(vdev_t *vd, zio_t *zio) 2440{ 2441 ASSERT(zio->io_vd == vd); 2442 2443 if (vdev_is_dead(vd) || vd->vdev_remove_wanted) 2444 return (B_FALSE); 2445 2446 if (zio->io_type == ZIO_TYPE_READ) 2447 return (!vd->vdev_cant_read); 2448 2449 if (zio->io_type == ZIO_TYPE_WRITE) 2450 return (!vd->vdev_cant_write); 2451 2452 return (B_TRUE); 2453} 2454 2455/* 2456 * Get statistics for the given vdev. 2457 */ 2458void 2459vdev_get_stats(vdev_t *vd, vdev_stat_t *vs) 2460{ 2461 vdev_t *rvd = vd->vdev_spa->spa_root_vdev; 2462 2463 mutex_enter(&vd->vdev_stat_lock); 2464 bcopy(&vd->vdev_stat, vs, sizeof (*vs)); 2465 vs->vs_timestamp = gethrtime() - vs->vs_timestamp; 2466 vs->vs_state = vd->vdev_state; 2467 vs->vs_rsize = vdev_get_min_asize(vd); 2468 if (vd->vdev_ops->vdev_op_leaf) 2469 vs->vs_rsize += VDEV_LABEL_START_SIZE + VDEV_LABEL_END_SIZE; 2470 mutex_exit(&vd->vdev_stat_lock); 2471 2472 /* 2473 * If we're getting stats on the root vdev, aggregate the I/O counts 2474 * over all top-level vdevs (i.e. the direct children of the root). 2475 */ 2476 if (vd == rvd) { 2477 for (int c = 0; c < rvd->vdev_children; c++) { 2478 vdev_t *cvd = rvd->vdev_child[c]; 2479 vdev_stat_t *cvs = &cvd->vdev_stat; 2480 2481 mutex_enter(&vd->vdev_stat_lock); 2482 for (int t = 0; t < ZIO_TYPES; t++) { 2483 vs->vs_ops[t] += cvs->vs_ops[t]; 2484 vs->vs_bytes[t] += cvs->vs_bytes[t]; 2485 } 2486 cvs->vs_scan_removing = cvd->vdev_removing; 2487 mutex_exit(&vd->vdev_stat_lock); 2488 } 2489 } 2490} 2491 2492void 2493vdev_clear_stats(vdev_t *vd) 2494{ 2495 mutex_enter(&vd->vdev_stat_lock); 2496 vd->vdev_stat.vs_space = 0; 2497 vd->vdev_stat.vs_dspace = 0; 2498 vd->vdev_stat.vs_alloc = 0; 2499 mutex_exit(&vd->vdev_stat_lock); 2500} 2501 2502void 2503vdev_scan_stat_init(vdev_t *vd) 2504{ 2505 vdev_stat_t *vs = &vd->vdev_stat; 2506 2507 for (int c = 0; c < vd->vdev_children; c++) 2508 vdev_scan_stat_init(vd->vdev_child[c]); 2509 2510 mutex_enter(&vd->vdev_stat_lock); 2511 vs->vs_scan_processed = 0; 2512 mutex_exit(&vd->vdev_stat_lock); 2513} 2514 2515void 2516vdev_stat_update(zio_t *zio, uint64_t psize) 2517{ 2518 spa_t *spa = zio->io_spa; 2519 vdev_t *rvd = spa->spa_root_vdev; 2520 vdev_t *vd = zio->io_vd ? zio->io_vd : rvd; 2521 vdev_t *pvd; 2522 uint64_t txg = zio->io_txg; 2523 vdev_stat_t *vs = &vd->vdev_stat; 2524 zio_type_t type = zio->io_type; 2525 int flags = zio->io_flags; 2526 2527 /* 2528 * If this i/o is a gang leader, it didn't do any actual work. 2529 */ 2530 if (zio->io_gang_tree) 2531 return; 2532 2533 if (zio->io_error == 0) { 2534 /* 2535 * If this is a root i/o, don't count it -- we've already 2536 * counted the top-level vdevs, and vdev_get_stats() will 2537 * aggregate them when asked. This reduces contention on 2538 * the root vdev_stat_lock and implicitly handles blocks 2539 * that compress away to holes, for which there is no i/o. 2540 * (Holes never create vdev children, so all the counters 2541 * remain zero, which is what we want.) 2542 * 2543 * Note: this only applies to successful i/o (io_error == 0) 2544 * because unlike i/o counts, errors are not additive. 2545 * When reading a ditto block, for example, failure of 2546 * one top-level vdev does not imply a root-level error. 2547 */ 2548 if (vd == rvd) 2549 return; 2550 2551 ASSERT(vd == zio->io_vd); 2552 2553 if (flags & ZIO_FLAG_IO_BYPASS) 2554 return; 2555 2556 mutex_enter(&vd->vdev_stat_lock); 2557 2558 if (flags & ZIO_FLAG_IO_REPAIR) { 2559 if (flags & ZIO_FLAG_SCAN_THREAD) { 2560 dsl_scan_phys_t *scn_phys = 2561 &spa->spa_dsl_pool->dp_scan->scn_phys; 2562 uint64_t *processed = &scn_phys->scn_processed; 2563 2564 /* XXX cleanup? */ 2565 if (vd->vdev_ops->vdev_op_leaf) 2566 atomic_add_64(processed, psize); 2567 vs->vs_scan_processed += psize; 2568 } 2569 2570 if (flags & ZIO_FLAG_SELF_HEAL) 2571 vs->vs_self_healed += psize; 2572 } 2573 2574 vs->vs_ops[type]++; 2575 vs->vs_bytes[type] += psize; 2576 2577 mutex_exit(&vd->vdev_stat_lock); 2578 return; 2579 } 2580 2581 if (flags & ZIO_FLAG_SPECULATIVE) 2582 return; 2583 2584 /* 2585 * If this is an I/O error that is going to be retried, then ignore the 2586 * error. Otherwise, the user may interpret B_FAILFAST I/O errors as 2587 * hard errors, when in reality they can happen for any number of 2588 * innocuous reasons (bus resets, MPxIO link failure, etc). 2589 */ 2590 if (zio->io_error == EIO && 2591 !(zio->io_flags & ZIO_FLAG_IO_RETRY)) 2592 return; 2593 2594 /* 2595 * Intent logs writes won't propagate their error to the root 2596 * I/O so don't mark these types of failures as pool-level 2597 * errors. 2598 */ 2599 if (zio->io_vd == NULL && (zio->io_flags & ZIO_FLAG_DONT_PROPAGATE)) 2600 return; 2601 2602 mutex_enter(&vd->vdev_stat_lock); 2603 if (type == ZIO_TYPE_READ && !vdev_is_dead(vd)) { 2604 if (zio->io_error == ECKSUM) 2605 vs->vs_checksum_errors++; 2606 else 2607 vs->vs_read_errors++; 2608 } 2609 if (type == ZIO_TYPE_WRITE && !vdev_is_dead(vd)) 2610 vs->vs_write_errors++; 2611 mutex_exit(&vd->vdev_stat_lock); 2612 2613 if (type == ZIO_TYPE_WRITE && txg != 0 && 2614 (!(flags & ZIO_FLAG_IO_REPAIR) || 2615 (flags & ZIO_FLAG_SCAN_THREAD) || 2616 spa->spa_claiming)) { 2617 /* 2618 * This is either a normal write (not a repair), or it's 2619 * a repair induced by the scrub thread, or it's a repair 2620 * made by zil_claim() during spa_load() in the first txg. 2621 * In the normal case, we commit the DTL change in the same 2622 * txg as the block was born. In the scrub-induced repair 2623 * case, we know that scrubs run in first-pass syncing context, 2624 * so we commit the DTL change in spa_syncing_txg(spa). 2625 * In the zil_claim() case, we commit in spa_first_txg(spa). 2626 * 2627 * We currently do not make DTL entries for failed spontaneous 2628 * self-healing writes triggered by normal (non-scrubbing) 2629 * reads, because we have no transactional context in which to 2630 * do so -- and it's not clear that it'd be desirable anyway. 2631 */ 2632 if (vd->vdev_ops->vdev_op_leaf) { 2633 uint64_t commit_txg = txg; 2634 if (flags & ZIO_FLAG_SCAN_THREAD) { 2635 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 2636 ASSERT(spa_sync_pass(spa) == 1); 2637 vdev_dtl_dirty(vd, DTL_SCRUB, txg, 1); 2638 commit_txg = spa_syncing_txg(spa); 2639 } else if (spa->spa_claiming) { 2640 ASSERT(flags & ZIO_FLAG_IO_REPAIR); 2641 commit_txg = spa_first_txg(spa); 2642 } 2643 ASSERT(commit_txg >= spa_syncing_txg(spa)); 2644 if (vdev_dtl_contains(vd, DTL_MISSING, txg, 1)) 2645 return; 2646 for (pvd = vd; pvd != rvd; pvd = pvd->vdev_parent) 2647 vdev_dtl_dirty(pvd, DTL_PARTIAL, txg, 1); 2648 vdev_dirty(vd->vdev_top, VDD_DTL, vd, commit_txg); 2649 } 2650 if (vd != rvd) 2651 vdev_dtl_dirty(vd, DTL_MISSING, txg, 1); 2652 } 2653} 2654 2655/* 2656 * Update the in-core space usage stats for this vdev, its metaslab class, 2657 * and the root vdev. 2658 */ 2659void 2660vdev_space_update(vdev_t *vd, int64_t alloc_delta, int64_t defer_delta, 2661 int64_t space_delta) 2662{ 2663 int64_t dspace_delta = space_delta; 2664 spa_t *spa = vd->vdev_spa; 2665 vdev_t *rvd = spa->spa_root_vdev; 2666 metaslab_group_t *mg = vd->vdev_mg; 2667 metaslab_class_t *mc = mg ? mg->mg_class : NULL; 2668 2669 ASSERT(vd == vd->vdev_top); 2670 2671 /* 2672 * Apply the inverse of the psize-to-asize (ie. RAID-Z) space-expansion 2673 * factor. We must calculate this here and not at the root vdev 2674 * because the root vdev's psize-to-asize is simply the max of its 2675 * childrens', thus not accurate enough for us. 2676 */ 2677 ASSERT((dspace_delta & (SPA_MINBLOCKSIZE-1)) == 0); 2678 ASSERT(vd->vdev_deflate_ratio != 0 || vd->vdev_isl2cache); 2679 dspace_delta = (dspace_delta >> SPA_MINBLOCKSHIFT) * 2680 vd->vdev_deflate_ratio; 2681 2682 mutex_enter(&vd->vdev_stat_lock); 2683 vd->vdev_stat.vs_alloc += alloc_delta; 2684 vd->vdev_stat.vs_space += space_delta; 2685 vd->vdev_stat.vs_dspace += dspace_delta; 2686 mutex_exit(&vd->vdev_stat_lock); 2687 2688 if (mc == spa_normal_class(spa)) { 2689 mutex_enter(&rvd->vdev_stat_lock); 2690 rvd->vdev_stat.vs_alloc += alloc_delta; 2691 rvd->vdev_stat.vs_space += space_delta; 2692 rvd->vdev_stat.vs_dspace += dspace_delta; 2693 mutex_exit(&rvd->vdev_stat_lock); 2694 } 2695 2696 if (mc != NULL) { 2697 ASSERT(rvd == vd->vdev_parent); 2698 ASSERT(vd->vdev_ms_count != 0); 2699 2700 metaslab_class_space_update(mc, 2701 alloc_delta, defer_delta, space_delta, dspace_delta); 2702 } 2703} 2704 2705/* 2706 * Mark a top-level vdev's config as dirty, placing it on the dirty list 2707 * so that it will be written out next time the vdev configuration is synced. 2708 * If the root vdev is specified (vdev_top == NULL), dirty all top-level vdevs. 2709 */ 2710void 2711vdev_config_dirty(vdev_t *vd) 2712{ 2713 spa_t *spa = vd->vdev_spa; 2714 vdev_t *rvd = spa->spa_root_vdev; 2715 int c; 2716 2717 ASSERT(spa_writeable(spa)); 2718 2719 /* 2720 * If this is an aux vdev (as with l2cache and spare devices), then we 2721 * update the vdev config manually and set the sync flag. 2722 */ 2723 if (vd->vdev_aux != NULL) { 2724 spa_aux_vdev_t *sav = vd->vdev_aux; 2725 nvlist_t **aux; 2726 uint_t naux; 2727 2728 for (c = 0; c < sav->sav_count; c++) { 2729 if (sav->sav_vdevs[c] == vd) 2730 break; 2731 } 2732 2733 if (c == sav->sav_count) { 2734 /* 2735 * We're being removed. There's nothing more to do. 2736 */ 2737 ASSERT(sav->sav_sync == B_TRUE); 2738 return; 2739 } 2740 2741 sav->sav_sync = B_TRUE; 2742 2743 if (nvlist_lookup_nvlist_array(sav->sav_config, 2744 ZPOOL_CONFIG_L2CACHE, &aux, &naux) != 0) { 2745 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, 2746 ZPOOL_CONFIG_SPARES, &aux, &naux) == 0); 2747 } 2748 2749 ASSERT(c < naux); 2750 2751 /* 2752 * Setting the nvlist in the middle if the array is a little 2753 * sketchy, but it will work. 2754 */ 2755 nvlist_free(aux[c]); 2756 aux[c] = vdev_config_generate(spa, vd, B_TRUE, 0); 2757 2758 return; 2759 } 2760 2761 /* 2762 * The dirty list is protected by the SCL_CONFIG lock. The caller 2763 * must either hold SCL_CONFIG as writer, or must be the sync thread 2764 * (which holds SCL_CONFIG as reader). There's only one sync thread, 2765 * so this is sufficient to ensure mutual exclusion. 2766 */ 2767 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 2768 (dsl_pool_sync_context(spa_get_dsl(spa)) && 2769 spa_config_held(spa, SCL_CONFIG, RW_READER))); 2770 2771 if (vd == rvd) { 2772 for (c = 0; c < rvd->vdev_children; c++) 2773 vdev_config_dirty(rvd->vdev_child[c]); 2774 } else { 2775 ASSERT(vd == vd->vdev_top); 2776 2777 if (!list_link_active(&vd->vdev_config_dirty_node) && 2778 !vd->vdev_ishole) 2779 list_insert_head(&spa->spa_config_dirty_list, vd); 2780 } 2781} 2782 2783void 2784vdev_config_clean(vdev_t *vd) 2785{ 2786 spa_t *spa = vd->vdev_spa; 2787 2788 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_WRITER) || 2789 (dsl_pool_sync_context(spa_get_dsl(spa)) && 2790 spa_config_held(spa, SCL_CONFIG, RW_READER))); 2791 2792 ASSERT(list_link_active(&vd->vdev_config_dirty_node)); 2793 list_remove(&spa->spa_config_dirty_list, vd); 2794} 2795 2796/* 2797 * Mark a top-level vdev's state as dirty, so that the next pass of 2798 * spa_sync() can convert this into vdev_config_dirty(). We distinguish 2799 * the state changes from larger config changes because they require 2800 * much less locking, and are often needed for administrative actions. 2801 */ 2802void 2803vdev_state_dirty(vdev_t *vd) 2804{ 2805 spa_t *spa = vd->vdev_spa; 2806 2807 ASSERT(spa_writeable(spa)); 2808 ASSERT(vd == vd->vdev_top); 2809 2810 /* 2811 * The state list is protected by the SCL_STATE lock. The caller 2812 * must either hold SCL_STATE as writer, or must be the sync thread 2813 * (which holds SCL_STATE as reader). There's only one sync thread, 2814 * so this is sufficient to ensure mutual exclusion. 2815 */ 2816 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 2817 (dsl_pool_sync_context(spa_get_dsl(spa)) && 2818 spa_config_held(spa, SCL_STATE, RW_READER))); 2819 2820 if (!list_link_active(&vd->vdev_state_dirty_node) && !vd->vdev_ishole) 2821 list_insert_head(&spa->spa_state_dirty_list, vd); 2822} 2823 2824void 2825vdev_state_clean(vdev_t *vd) 2826{ 2827 spa_t *spa = vd->vdev_spa; 2828 2829 ASSERT(spa_config_held(spa, SCL_STATE, RW_WRITER) || 2830 (dsl_pool_sync_context(spa_get_dsl(spa)) && 2831 spa_config_held(spa, SCL_STATE, RW_READER))); 2832 2833 ASSERT(list_link_active(&vd->vdev_state_dirty_node)); 2834 list_remove(&spa->spa_state_dirty_list, vd); 2835} 2836 2837/* 2838 * Propagate vdev state up from children to parent. 2839 */ 2840void 2841vdev_propagate_state(vdev_t *vd) 2842{ 2843 spa_t *spa = vd->vdev_spa; 2844 vdev_t *rvd = spa->spa_root_vdev; 2845 int degraded = 0, faulted = 0; 2846 int corrupted = 0; 2847 vdev_t *child; 2848 2849 if (vd->vdev_children > 0) { 2850 for (int c = 0; c < vd->vdev_children; c++) { 2851 child = vd->vdev_child[c]; 2852 2853 /* 2854 * Don't factor holes into the decision. 2855 */ 2856 if (child->vdev_ishole) 2857 continue; 2858 2859 if (!vdev_readable(child) || 2860 (!vdev_writeable(child) && spa_writeable(spa))) { 2861 /* 2862 * Root special: if there is a top-level log 2863 * device, treat the root vdev as if it were 2864 * degraded. 2865 */ 2866 if (child->vdev_islog && vd == rvd) 2867 degraded++; 2868 else 2869 faulted++; 2870 } else if (child->vdev_state <= VDEV_STATE_DEGRADED) { 2871 degraded++; 2872 } 2873 2874 if (child->vdev_stat.vs_aux == VDEV_AUX_CORRUPT_DATA) 2875 corrupted++; 2876 } 2877 2878 vd->vdev_ops->vdev_op_state_change(vd, faulted, degraded); 2879 2880 /* 2881 * Root special: if there is a top-level vdev that cannot be 2882 * opened due to corrupted metadata, then propagate the root 2883 * vdev's aux state as 'corrupt' rather than 'insufficient 2884 * replicas'. 2885 */ 2886 if (corrupted && vd == rvd && 2887 rvd->vdev_state == VDEV_STATE_CANT_OPEN) 2888 vdev_set_state(rvd, B_FALSE, VDEV_STATE_CANT_OPEN, 2889 VDEV_AUX_CORRUPT_DATA); 2890 } 2891 2892 if (vd->vdev_parent) 2893 vdev_propagate_state(vd->vdev_parent); 2894} 2895 2896/* 2897 * Set a vdev's state. If this is during an open, we don't update the parent 2898 * state, because we're in the process of opening children depth-first. 2899 * Otherwise, we propagate the change to the parent. 2900 * 2901 * If this routine places a device in a faulted state, an appropriate ereport is 2902 * generated. 2903 */ 2904void 2905vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state, vdev_aux_t aux) 2906{ 2907 uint64_t save_state; 2908 spa_t *spa = vd->vdev_spa; 2909 2910 if (state == vd->vdev_state) { 2911 vd->vdev_stat.vs_aux = aux; 2912 return; 2913 } 2914 2915 save_state = vd->vdev_state; 2916 2917 vd->vdev_state = state; 2918 vd->vdev_stat.vs_aux = aux; 2919 2920 /* 2921 * If we are setting the vdev state to anything but an open state, then 2922 * always close the underlying device unless the device has requested 2923 * a delayed close (i.e. we're about to remove or fault the device). 2924 * Otherwise, we keep accessible but invalid devices open forever. 2925 * We don't call vdev_close() itself, because that implies some extra 2926 * checks (offline, etc) that we don't want here. This is limited to 2927 * leaf devices, because otherwise closing the device will affect other 2928 * children. 2929 */ 2930 if (!vd->vdev_delayed_close && vdev_is_dead(vd) && 2931 vd->vdev_ops->vdev_op_leaf) 2932 vd->vdev_ops->vdev_op_close(vd); 2933 2934 /* 2935 * If we have brought this vdev back into service, we need 2936 * to notify fmd so that it can gracefully repair any outstanding 2937 * cases due to a missing device. We do this in all cases, even those 2938 * that probably don't correlate to a repaired fault. This is sure to 2939 * catch all cases, and we let the zfs-retire agent sort it out. If 2940 * this is a transient state it's OK, as the retire agent will 2941 * double-check the state of the vdev before repairing it. 2942 */ 2943 if (state == VDEV_STATE_HEALTHY && vd->vdev_ops->vdev_op_leaf && 2944 vd->vdev_prevstate != state) 2945 zfs_post_state_change(spa, vd); 2946 2947 if (vd->vdev_removed && 2948 state == VDEV_STATE_CANT_OPEN && 2949 (aux == VDEV_AUX_OPEN_FAILED || vd->vdev_checkremove)) { 2950 /* 2951 * If the previous state is set to VDEV_STATE_REMOVED, then this 2952 * device was previously marked removed and someone attempted to 2953 * reopen it. If this failed due to a nonexistent device, then 2954 * keep the device in the REMOVED state. We also let this be if 2955 * it is one of our special test online cases, which is only 2956 * attempting to online the device and shouldn't generate an FMA 2957 * fault. 2958 */ 2959 vd->vdev_state = VDEV_STATE_REMOVED; 2960 vd->vdev_stat.vs_aux = VDEV_AUX_NONE; 2961 } else if (state == VDEV_STATE_REMOVED) { 2962 vd->vdev_removed = B_TRUE; 2963 } else if (state == VDEV_STATE_CANT_OPEN) { 2964 /* 2965 * If we fail to open a vdev during an import or recovery, we 2966 * mark it as "not available", which signifies that it was 2967 * never there to begin with. Failure to open such a device 2968 * is not considered an error. 2969 */ 2970 if ((spa_load_state(spa) == SPA_LOAD_IMPORT || 2971 spa_load_state(spa) == SPA_LOAD_RECOVER) && 2972 vd->vdev_ops->vdev_op_leaf) 2973 vd->vdev_not_present = 1; 2974 2975 /* 2976 * Post the appropriate ereport. If the 'prevstate' field is 2977 * set to something other than VDEV_STATE_UNKNOWN, it indicates 2978 * that this is part of a vdev_reopen(). In this case, we don't 2979 * want to post the ereport if the device was already in the 2980 * CANT_OPEN state beforehand. 2981 * 2982 * If the 'checkremove' flag is set, then this is an attempt to 2983 * online the device in response to an insertion event. If we 2984 * hit this case, then we have detected an insertion event for a 2985 * faulted or offline device that wasn't in the removed state. 2986 * In this scenario, we don't post an ereport because we are 2987 * about to replace the device, or attempt an online with 2988 * vdev_forcefault, which will generate the fault for us. 2989 */ 2990 if ((vd->vdev_prevstate != state || vd->vdev_forcefault) && 2991 !vd->vdev_not_present && !vd->vdev_checkremove && 2992 vd != spa->spa_root_vdev) { 2993 const char *class; 2994 2995 switch (aux) { 2996 case VDEV_AUX_OPEN_FAILED: 2997 class = FM_EREPORT_ZFS_DEVICE_OPEN_FAILED; 2998 break; 2999 case VDEV_AUX_CORRUPT_DATA: 3000 class = FM_EREPORT_ZFS_DEVICE_CORRUPT_DATA; 3001 break; 3002 case VDEV_AUX_NO_REPLICAS: 3003 class = FM_EREPORT_ZFS_DEVICE_NO_REPLICAS; 3004 break; 3005 case VDEV_AUX_BAD_GUID_SUM: 3006 class = FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM; 3007 break; 3008 case VDEV_AUX_TOO_SMALL: 3009 class = FM_EREPORT_ZFS_DEVICE_TOO_SMALL; 3010 break; 3011 case VDEV_AUX_BAD_LABEL: 3012 class = FM_EREPORT_ZFS_DEVICE_BAD_LABEL; 3013 break; 3014 default: 3015 class = FM_EREPORT_ZFS_DEVICE_UNKNOWN; 3016 } 3017 3018 zfs_ereport_post(class, spa, vd, NULL, save_state, 0); 3019 } 3020 3021 /* Erase any notion of persistent removed state */ 3022 vd->vdev_removed = B_FALSE; 3023 } else { 3024 vd->vdev_removed = B_FALSE; 3025 } 3026 3027 if (!isopen && vd->vdev_parent) 3028 vdev_propagate_state(vd->vdev_parent); 3029} 3030 3031/* 3032 * Check the vdev configuration to ensure that it's capable of supporting 3033 * a root pool. 3034 * 3035 * On Solaris, we do not support RAID-Z or partial configuration. In 3036 * addition, only a single top-level vdev is allowed and none of the 3037 * leaves can be wholedisks. 3038 * 3039 * For FreeBSD, we can boot from any configuration. There is a 3040 * limitation that the boot filesystem must be either uncompressed or 3041 * compresses with lzjb compression but I'm not sure how to enforce 3042 * that here. 3043 */ 3044boolean_t 3045vdev_is_bootable(vdev_t *vd) 3046{ 3047#ifdef sun 3048 if (!vd->vdev_ops->vdev_op_leaf) { 3049 char *vdev_type = vd->vdev_ops->vdev_op_type; 3050 3051 if (strcmp(vdev_type, VDEV_TYPE_ROOT) == 0 && 3052 vd->vdev_children > 1) { 3053 return (B_FALSE); 3054 } else if (strcmp(vdev_type, VDEV_TYPE_RAIDZ) == 0 || 3055 strcmp(vdev_type, VDEV_TYPE_MISSING) == 0) { 3056 return (B_FALSE); 3057 } 3058 } else if (vd->vdev_wholedisk == 1) { 3059 return (B_FALSE); 3060 } 3061 3062 for (int c = 0; c < vd->vdev_children; c++) { 3063 if (!vdev_is_bootable(vd->vdev_child[c])) 3064 return (B_FALSE); 3065 } 3066#endif /* sun */ 3067 return (B_TRUE); 3068} 3069 3070/* 3071 * Load the state from the original vdev tree (ovd) which 3072 * we've retrieved from the MOS config object. If the original 3073 * vdev was offline or faulted then we transfer that state to the 3074 * device in the current vdev tree (nvd). 3075 */ 3076void 3077vdev_load_log_state(vdev_t *nvd, vdev_t *ovd) 3078{ 3079 spa_t *spa = nvd->vdev_spa; 3080 3081 ASSERT(nvd->vdev_top->vdev_islog); 3082 ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 3083 ASSERT3U(nvd->vdev_guid, ==, ovd->vdev_guid); 3084 3085 for (int c = 0; c < nvd->vdev_children; c++) 3086 vdev_load_log_state(nvd->vdev_child[c], ovd->vdev_child[c]); 3087 3088 if (nvd->vdev_ops->vdev_op_leaf) { 3089 /* 3090 * Restore the persistent vdev state 3091 */ 3092 nvd->vdev_offline = ovd->vdev_offline; 3093 nvd->vdev_faulted = ovd->vdev_faulted; 3094 nvd->vdev_degraded = ovd->vdev_degraded; 3095 nvd->vdev_removed = ovd->vdev_removed; 3096 } 3097} 3098 3099/* 3100 * Determine if a log device has valid content. If the vdev was 3101 * removed or faulted in the MOS config then we know that 3102 * the content on the log device has already been written to the pool. 3103 */ 3104boolean_t 3105vdev_log_state_valid(vdev_t *vd) 3106{ 3107 if (vd->vdev_ops->vdev_op_leaf && !vd->vdev_faulted && 3108 !vd->vdev_removed) 3109 return (B_TRUE); 3110 3111 for (int c = 0; c < vd->vdev_children; c++) 3112 if (vdev_log_state_valid(vd->vdev_child[c])) 3113 return (B_TRUE); 3114 3115 return (B_FALSE); 3116} 3117 3118/* 3119 * Expand a vdev if possible. 3120 */ 3121void 3122vdev_expand(vdev_t *vd, uint64_t txg) 3123{ 3124 ASSERT(vd->vdev_top == vd); 3125 ASSERT(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3126 3127 if ((vd->vdev_asize >> vd->vdev_ms_shift) > vd->vdev_ms_count) { 3128 VERIFY(vdev_metaslab_init(vd, txg) == 0); 3129 vdev_config_dirty(vd); 3130 } 3131} 3132 3133/* 3134 * Split a vdev. 3135 */ 3136void 3137vdev_split(vdev_t *vd) 3138{ 3139 vdev_t *cvd, *pvd = vd->vdev_parent; 3140 3141 vdev_remove_child(pvd, vd); 3142 vdev_compact_children(pvd); 3143 3144 cvd = pvd->vdev_child[0]; 3145 if (pvd->vdev_children == 1) { 3146 vdev_remove_parent(cvd); 3147 cvd->vdev_splitting = B_TRUE; 3148 } 3149 vdev_propagate_state(cvd); 3150} 3151